where can i get a replacement for a broken door keep?

Our Upvc door slammed shut the other and day and the plastic frame and internal door keep broke.
It is a multi point lock but its only the centre keep that is broken.
I have looked all over the door trying to find a make of the lock but cant find anything.
I have taken the keep off the door and have a photo.
It seems like a really easy thing to replace but I just cant find out the make.
The only thing I can find is HDL 42 K mark in the keep.
It is a multipoint hook door and the handle needs to be lifted to move the hooks into the door. However the keep thats broken is the latch and deadbolt in the centre (hooks are at the top and bottom)

The house is an ex council house and the door was put in by the council before we bought it.

ANy ideas?