FE thanks for the link but its not there, The door is 28 years old and I have managed to find a universal lock and roller set for it, also a door gasket.
However the roller locks are not available or the frame seal/gasket as I have been in touch with the original supplier.
They said the lock wasn't available also, but I have found it by the same manufacture under a different code number for £70 inc pp.
Trouble is I had two doors fitted at the same time and both could do with gaskets etc. as they are no longer air tight.