Depending on the make you can buy new seals. We had one put in ours recently and first time it rained I though, balls... But a little smear of vaseline stopped it T: and that was 4mths ago and still nice and dry.
Nice one, give us a shout if you're about this neck of the woods next time.
The guy that fitted our roof is in Devon but I'd guess he could post you a seal, but defo try the vaseline first Really sound guy called Nigel: http://www.southwestsunroofs.co.uk/contact-us He does all the Totally T4 roofs. He showed me a photo of a T4 with four sunroofs fitted!. Cheers, Chris