Where can i find the plastic bit that goes between my shower door and the bath?

We have a Glass shower door and at the bottom and down the wall side it has a plastic flexible water deflector which also has a rubber seal along the bottom so as to make the shower door water tight from the inside of the bath it slides onto the glass door by means of a rigid 5mm wide groove which grips the glass at both sides, while B%26amp;Q supply this with the sower and bath they do not offer replacements, can you advise where it might be available.Where can i find the plastic bit that goes between my shower door and the bath?
We had a similar problem, but luckily our shower was only weeks old when my son pulled off the seal-strip and buckled it out of shape. I thought like you, where do i get a replacement, so I went back to the shop we bought it and they put us in touch with the manufacturers who sent us a new one free of charge (the company was called t.c.)