Hi Peter.
I don’t know what you’ve learnt since your post, but have you tried getting in touch with social services?
Find the Adoption dept. of the council where you are currently live, (not the council that dealt with your adoption, unless you still live there), and ask them about the process of seeing your adoption records. They will interview you first, and then start the process. Could take up to 6 months, sometimes longer. Good luck.