In reply to CharlotteM:
> Be aware they are grey imports and you may not be able to get them serviced in the UK.
You can get them serviced/repaired no bother, it's just that Nikon UK/Canon UK/Sigma UK etc will not honour any warranty claims, so even if your stuff is days old and faulty, you have to pay for the repair. Last lens I bought from Digital Rev was back in 2006, so I can't comment on their recent performance, but I found them OK (My lens was delivered with a receipt saying "Replacement under Warranty" cough cough...)