Firefox AND IE problem

I have had a site up and running for quite some time.

https://countylandscapeshampshire.co.uk

All of a sudden, it just hangs in Firefox and IE.

My iphone displays it correctly (so thats Safari)

but the fellow I set it up for has had complaints from prospective customers that his site is broken.

I can log into the admin panel OK and can see the images there, and I haven’t updated anything ( as far as I know) it has just stopped working, displayinf the spinney turney “loading” thing.

Please suggest a solution

Martin