These days AC is hosted at LiquidWeb.com, although they do sell Shared Hosting they seem to specialise in dedicated hosting.
I'd recommend trying out http://vt6.co.uk
, which ac used until a few months ago (we only moved as one of our sites got to big and needed a dedicated server). Hosting starts from £2.50 a month
Is the hosting only for one site?
Edited: Spelling mistake