I just had the windscreen out and welded and refitted with a new seal and all the photos to show it was done properly by this guy for a very good price:
Very nice bloke called James runs it. Maybe a bit far from you but the savings could make it worth a trip.
I very rarely recommend tradesman but I would recommend this guy. I'd take anything to him. Even did some free work while he did the paid stuff and offered tips and tricks for doing some work myself..