Thanks again for the responses.
For the record, I went with Silverprint. I would have tried Ag but they didn't list anything under 'Wetting Agents' and thus no Ilfotol. Firstcall have a good website, they had a handy sized bottle of fixer (500ml) and their prices are competitive but when I checked the Apug sponsor list, only Silverprint was listed.
It is pretty convenient really, to just look up the list online, browse a few websites, and sit back and wait for the magic chemicals. Now all I need are a few badly-exposed negatives, which I shall get to work on straight away.
All the best, Jon.