Sudden 500 Errors on Home Page

Hello, I have been developing a Joomla website on my development hosting package, all was good and complete so we transfered it over to the client's web hosting.

Inexplicably both the mirror copies on both hosting services are down.

We get 500 error messages on the home pages on both websites and nothing has cahnged over night on either.

I have narrowed it down to something to do with the template (Gavick Coffe) as if I change the template to the Joomla default templates, the website loads fine.

I have reuploaded the template files and it is still not working.

I can however log into the admin page on both websites

Worked long hours on this all week and this happens on a friday night plus angry client and all that.

Can anyone help please?

Lie website www.nightoutinlondon.com

development website

www.amphibiandiveshop.org/noin

Hi

I can see site is working ok now. Is it just a coinsidence or You have fixed it already.