Hello @sewotherspoon,
Thanks for reaching out. I have checked your site and I am seeing a JS error present on the page.
Uncaught TypeError: Cannot read property 'noConflict' of undefined
at (index):1178
www.tbmes.co.uk/:1231 Uncaught SyntaxError: Unexpected token '<'
I also found out that you have added the Google Tag Manager code into your site incorrectly. Please be advised that you are not supposed to insert this code into the X > Theme Options > JS area.
<!-- Google Tag Manager -->
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-T6294BQ');</script>
<!-- End Google Tag Manager --></script>
Please do check this thread instead to know how you can properly add the Google Tag Manager into your site:
Regards.