The full-Q is basically a well thought out installation of Q-Mail with a lot of admin and monitoring tools. I have done Q-Mail installation myself and got them going reasonable well but the folk at Inter-7 seem to have a bit of a knack. It is just the software. They will want you to present them with a server with a full Linux installation.

Server location choice is a ticklish issue - but only for spammers, for you it is straightforward. Being in the UK will make the whole process easier and get the mail through faster. I have tried lower cost options, I am in Canada and I used to host in the US. But I can't get to machines easilly and I find it far more convenient to have the machine 5km down the road than across a border or even worse, an ocean.

Good luck jdtoronto