I find threads like this a little bit sad. When someone has spent a lot of money (about £2000 in this case) on something they're not happy with, after following the advice of other people. There's also a high chance he may not be able to return it all for a full refund. And if he were to sell it via an online auction site he'd probably have to swallow a considerable financial loss.
Looking at it in a positive way, zilli and everyone else reading this can treat it as a learning experience. I am confident that he can acheive the sort of sound quality he is after without spending a single penny more. Either by making adjustments to how it has all been set-up, or identifying something that's not fully working and would therefore get replaced under guarantee or by selling some or all of it and replacing it with less expensive but significantly better sounding items.
A nice first step for zilli would be to get his system and a reference system together in the same room to identify what exactly is causing the disappointing sound he's been getting. I'd be happy to pop round to his place myself if he lives near West Yorkshire.