Master Page template giving 404 errors

Hi Folks, Starting a new thread which has spun off an other thread as I've invariably run into a new problem. I'm using Perch Runway and it is up and running so far without issue. I'm setting up routing for a product detail page and I've noticed that when trying to create a new page based on my master page template, no matter what I do, I get a 404 error on the browser. I've tried creating a page on the default pages template and get the same thing, I've also tried a separate pages template from a different website, again it just goes straight to 404. Are there any known issues with pages app, runway and web-hosting? The site is on SSL, could this have any bearing? All Perch SSL rules are applied in config file and static files. Here are my details:

HTACCESS FILE

RewriteEngine On 
RewriteCond %{HTTPS} off 
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

 # Perch Runway
RewriteEngine On
RewriteCond %{REQUEST_URI} !^/perch
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* /perch/core/runway/start.php [L]

DIAGNOSTICS

Perch Runway: 3.1.2, PHP: 7.1.20, MySQL: 5.6.39, with PDO
Server OS: Linux, cgi-fcgi
Installed apps: content (3.1.2), assets (3.1.2), categories (3.1.2), perch_blog (5.6.1), perch_shop_orders (1.2.6), perch_shop_products (1.2.6), chirp_seo (1.2.1), perch_shop (1.2.6), perch_members (1.6.4)
App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_blog', 'perch_members', 'perch_shop', ); ?>
PERCH_LOGINPATH: /perch
PERCH_PATH: /var/www/vhosts/142/1004491/webspace/httpdocs/perch
PERCH_CORE: /var/www/vhosts/142/1004491/webspace/httpdocs/perch/core
PERCH_RESFILEPATH: /var/www/vhosts/142/1004491/webspace/httpdocs/perch/resources
Image manipulation: GD Imagick
PHP limits: Max upload 32M, Max POST 32M, Memory: 256M, Total max file upload: 32M
F1: 3b606135b33e6a102526838f4152a807
Resource folder writeable: Yes
HTTP_HOST: www.lirchocolates.com
DOCUMENT_ROOT: /var/www/vhosts/142/1004491/webspace/httpdocs
REQUEST_URI: /perch/core/settings/diagnostics/
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

MASTER PAGE TEMPLATE

<?php include($_SERVER['DOCUMENT_ROOT'].'/perch/runtime.php'); ?>

<?php perch_layout('shop.header'); ?>

  <div class="brand shop-hero">
    <div class="container">
      <div class="logo-wrapper"><img src="../images/lir-master-light-horiz2.png" srcset="../images/lir-master-light-horiz2-p-1080.png 1080w, ../images/lir-master-light-horiz2-p-1600.png 1600w, ../images/lir-master-light-horiz2.png 1687w" sizes="(max-width: 479px) 72vw, (max-width: 991px) 40vw, 32vw" class="logo"></div>
    </div>
  </div>
  <div class="container"></div>
  <div class="product">
    <div class="container">
      <div class="blog-posting w-row">
        <div class="left-col w-col w-col-4">

                 <?php perch_categories([
                'template' => 'category.html',
                'category' => 'shop/'.perch_get('category'),
          ]
            ); ?>
            <a href="../shop/index.php" class="button b2b w-button">back to shop</a>
          <div class="share">
            <h3>share this post</h3>
          </div>
          <div class="sharethis">
            <div class="sharethiscode w-embed">
              <div class="sharethis-inline-share-buttons"></div>
            </div>
          </div>
        </div>
        <div class="right-col w-col w-col-8">

            <?php perch_shop_product(perch_get('product'));?>


        </div>
      </div>
    </div>
  </div>
<?php perch_layout('blog.footer'); ?>