Form and links not clickable after PHP 7.0

Hi guys,

Hope you can help!
PHP was recently upgraded to 7.0 and it’s caused an issue with the site – specifically, users now can’t click on links or form fields on the contact us page: http://www.robinsonslondon.com/contact/

I’ve reset PHP to 5.3 and restored all files and DBs to pre-upgrade but the problem is still there now. Seems to occur on all browsers – Chrome/Firefox/Edge

Any idea why this is happening?
And how I can fix it?

Speak soon,
Chris