Hi. This is Kathy with DUI. I saw your post and asked Pam Oliva - our repair guru for her suggestion. Here it is:
It looks as if the issue is easily repairable. The area in question should be cleaned of any debris, buffed with sand paper (or dremel tool) wiped down with trichloroethane or similar cleaner, and then re-glued. Something like bostick 2402 (adhesive) with its acclerator (bostikure) will help. You will need to apply 2 - 3 even coats to both sides that will be bonded, and allow to dry 5 - 7 minutes between the first 2 coats, and then no more than 5 minutes on the last coat. NOTE: mix only what you feel you would need as when mixed, becomes thick within an hour or so.
Attach both sides together, and apply pressure with a seam roller (or place a couple of soft weights onto the area for a couple of hours.) This should be ample time for the adhesive to cure and set.
(Bostick 2402 should be available in the U.K. and European countries.)
Good luck!
Thanks!