Customer address not being stored or passed to PayPal

Sure.

From the cart I go to a page with this little bit of code, which then redirects to PayPal:

    <?php

      if (!perch_shop_addresses_set()) {
        perch_shop_edit_address_form(false, [
          'template' => 'checkout/customer_create_passwordless.html',
        ]);
      }else{

        // your 'success' return URL
        $return_url = 'https://www.***.org.uk/paypal-complete.php';
        $cancel_url = 'https://www.***.org.uk/paypal-failed.php';

        perch_shop_checkout('paypal-express', [
          'return_url' => $return_url,
          'cancel_url' => $cancel_url,
        ]);
       }
    ?>

I wish I knew, Drew. Perhaps a lesson in using source control.

I've looked through everything that I've changed since Friday, when I believe it was working, but I'm just not seeing what it could be.

Is there anywhere in particular I should be/could be looking?

Apologies for the vague rubbishness.

This is part of the debug output from the PayPal payment complete page, does it shed any light on the issue:

UPDATE perch3_shop_orders_meta SET metaValue=last_insert_id(metaValue+1) WHERE id='last_invoice_number'
[1] SELECT last_insert_id()
UPDATE perch3_shop_orders SET orderInvoiceNumber='Invoice17', orderUpdated='2018-01-30 15:37:49' WHERE orderID='28'
No ids to log.
Setting order status to paid
UPDATE perch3_shop_orders SET orderDynamicFields='{\"status\":\"paid\"}', orderStatus='paid', orderUpdated='2018-01-30 15:37:49' WHERE orderID='28'
No ids to log.
Array
(
    [country] => GB
)
[1] SELECT * FROM perch3_shop_countries WHERE iso2='GB' LIMIT 1
[1] SELECT * FROM perch3_shop_tax_locations WHERE locationDeleted IS NULL AND ((countryID=236 AND regionID IS NULL) OR locationIsDefault=1) ORDER BY locationIsDefault ASC LIMIT 1
INSERT INTO perch3_shop_tax_exhibits(orderID,exhibitType,exhibitDetail,exhibitSource,locationID,countryID,exhibitDate) VALUES(28,'CARD_ADDRESS','GB','PayPal_Express','1','236','2018-01-30 15:37:51')
[1] SELECT * FROM perch3_shop_tax_exhibits WHERE exhibitID='77' LIMIT 1
No ids to log.
UPDATE perch3_shop_tax_exhibits SET orderID=28, exhibitType='CARD_ADDRESS', exhibitDetail='GB', exhibitSource='PayPal_Express', locationID='1', countryID='236', exhibitDate='2018-01-30 15:37:51' WHERE exhibitID='77'
No ids to log.
[1] SELECT * FROM perch3_shop_addresses WHERE addressID='102' AND addressDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_shop_tax_locations WHERE locationDeleted IS NULL AND ((countryID=0 AND regionID IS NULL) OR locationIsDefault=1) ORDER BY locationIsDefault ASC LIMIT 1
Looking up missing property address_1
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property address_2
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property city
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property county
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property postcode
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
INSERT INTO perch3_shop_tax_exhibits(orderID,exhibitType,exhibitDetail,exhibitSource,locationID,countryID,exhibitDate) VALUES(28,'BILL_ADDRESS',', ','Customer','1','0','2018-01-30 15:37:51')
[1] SELECT * FROM perch3_shop_tax_exhibits WHERE exhibitID='78' LIMIT 1
No ids to log.
UPDATE perch3_shop_tax_exhibits SET orderID=28, exhibitType='BILL_ADDRESS', exhibitDetail=', ', exhibitSource='Customer', locationID='1', countryID='0', exhibitDate='2018-01-30 15:37:51' WHERE exhibitID='78'
No ids to log.
[1] SELECT * FROM perch3_shop_addresses WHERE addressID='103' AND addressDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_shop_tax_locations WHERE locationDeleted IS NULL AND ((countryID=0 AND regionID IS NULL) OR locationIsDefault=1) ORDER BY locationIsDefault ASC LIMIT 1
Looking up missing property address_1
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property address_2
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property city
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property county
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
Looking up missing property postcode
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
INSERT INTO perch3_shop_tax_exhibits(orderID,exhibitType,exhibitDetail,exhibitSource,locationID,countryID,exhibitDate) VALUES(28,'SHIP_ADDRESS',', ','Customer','1','0','2018-01-30 15:37:51')
[1] SELECT * FROM perch3_shop_tax_exhibits WHERE exhibitID='79' LIMIT 1
No ids to log.
UPDATE perch3_shop_tax_exhibits SET orderID=28, exhibitType='SHIP_ADDRESS', exhibitDetail=', ', exhibitSource='Customer', locationID='1', countryID='0', exhibitDate='2018-01-30 15:37:51' WHERE exhibitID='79'
No ids to log.
[1] SELECT * FROM perch3_shop_order_statuses WHERE statusKey='paid' AND statusActive=1 AND statusDeleted IS NULL
[1] SELECT * FROM perch3_shop_emails WHERE emailStatus=3 AND emailActive=1
Sending customer email
[1] SELECT * FROM perch3_shop_customers WHERE customerID='12' AND customerDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_members WHERE memberID='12' LIMIT 1
Using email template: /homepages/21/d688763965/htdocs/utt/perch/templates/shop/emails/order_paid.html (html)
[1] SELECT * FROM perch3_shop_order_statuses WHERE statusKey='paid' AND statusDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_shop_addresses WHERE addressID=103 AND addressDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
[1] SELECT * FROM perch3_shop_addresses WHERE addressID=102 AND addressDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_shop_countries WHERE countryID='0' LIMIT 1
No country set for address (name)
[1] SELECT * FROM perch3_shop_order_items WHERE orderID='28' ORDER BY itemID ASC
[1] SELECT * FROM perch3_shop_order_statuses WHERE statusKey='paid' AND statusDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_shop_currencies WHERE currencyID=47 LIMIT 1
[1] SELECT * FROM perch3_shop_shippings WHERE shippingID=0 AND shippingDeleted IS NULL LIMIT 1
[1] SELECT * FROM perch3_shop_products WHERE productID=24 AND productDeleted IS NULL LIMIT 1
[0] SELECT promoID FROM perch3_shop_order_promotions WHERE orderID=28

Yes, an order will create a member and I can manually create a member via Perch Admin. There are no fields for Address details, though.

The form uses this template: /addons/apps/perch_members/templates/members/member.html

I followed the passwordless example in the docs, I'm using:

perch_shop_edit_address_form(false, [ 'template' => 'checkout/customer_create_passwordless.html', ]);

Oh, apologies for the confusion, I'm not using it, it's the form used on the Perch Admin Members page.

I was just wondering if the address should show on that template, as it doesn't on mine.

I actually believe I fixed this by deleting and re-adding the perch folder and running setup again. Then adding my templates back in.