Google systems have tested 174 pages from your site and found that 49% of them have critical mobile usability errors. The errors on these 85 pages severely affect how mobile users are able to experience your website. These pages will not be seen as mobile-friendly by Google Search, and will therefore be displayed and ranked appropriately for smartphone users.

Touch Elements To Close 85 pages
Content Not Sized To Viewport 83 pages

Please could you kindly advise as I do not wish to move templates as I really love your work
just so you know I am fully up to date with Word Press and the Minicorp wp

Best regards Marcus

Yes, Google is sending those messages to a vast majority of users. We cannot really say why you have so many issues. If you view this mobile friendliness checker:

https://www.google.com/webmasters/tools/mobile-friendly/?url=http%3A%2F%2Fthemes.ishyoboy.com%2Fmulticorp%2F

You will see that it passes the test:

Please check this guide that Google suggest in the e-mail but you will see that the result is the same:
https://developers.google.com/webmasters/mobile-sites/website-software/wordpress

Cheers

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