Why have right hand columns been pushed to foot of page?

You probably miss a </div> somewhere in your index.php.

I just figured out that this issue occurs in Firefox and older versions of IE. The latest version of IE displays it okay.

Anyone know why this is?

https://validator.w3.org/check?uri=https://www.weedrew.co.uk/

start by fixing those errors.

Resolved, it was a post containing an embedded movie on youtube. I’ll need to go find out how to do that properly in wordpress.

Thanks for the tips.