Rejected shipping methods

I'm getting the following errors when adding something to my basket or at the checkout confirmation stage (after addresses are set). No shipping method is being chosen (there are only 2 in the system).

Undefined index: zones in [...]/perch/addons/apps/perch_shop/lib/PerchShop_Shippings.class.php on line 32

and

in_array() expects parameter 2 to be array, null given in [...]perch/addons/apps/perch_shop/lib/PerchShop_Shippings.class.php on line 32

Perch Debug says

Rejecting shipping method ‘Standard’ because: no price available for chosen shipping zone
Rejecting shipping method ‘Large items’ because: no price available for chosen shipping zone

So I'm sure I don't have shipping set up correctly but I can't find anywhere to enter a price against a specific shipping zone.

Shipping is UK only. I have a single zone set up for UK and address country is hard coded to UK as well.

Shipping is based on product weight. Most products weigh 0 and attract one price. One or more large items in the basket (anything weighing over zero) attract the higher price. Products are entered with a weight of 0 or 1.

I've re-saved everything a few times.

What am I missing?

Diagnostics below...

    Perch Runway: 2.8.29, PHP: 7.0.0, MySQL: mysqlnd 5.0.12-dev - 20150407 - $Id: 7e72f9690b1498a1bead7a637c33a831c0d2f655 $, with PDO
    Server OS: Darwin, apache2handler
    Installed apps: content (2.8.29), assets (2.8.29), categories (2.8.29), perch_blog (5.0), perch_forms (1.8.3), perch_shop_orders (1.0), perch_shop_products (1.0), perch_shop (1.0.1), perch_members (1.5)
    App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_blog', 'perch_forms', 'perch_members', 'perch_shop' );
    PERCH_RESFILEPATH: [...]/httpdocs/assets/resources
    PERCH_LOGINPATH: /perch
    PERCH_PATH: [...]/httpdocs/perch
    PERCH_CORE: [...]/httpdocs/perch/core
    Image manipulation: GD
    PHP limits: Max upload 32M, Max POST 32M, Memory: 128M, Total max file upload: 32M
    F1: 2edba60ed1f613d6dd804feb202456a2
    Resource folder writeable: Yes
    HTTP_HOST: et:8888
    DOCUMENT_ROOT: [...]/httpdocs
    REQUEST_URI: /perch/core/settings/diagnostics/
    SCRIPT_NAME: /perch/core/settings/diagnostics/index.php