could anyone give me information and contact details of boxer breeders in the west midlands

If you go to this website they list some Boxer breeders.
This site also lists the contact details of Boxer breed clubs in your area.
You could also try them too as they will be able to pass on details of breeders
that do not have internet access etc.
http://www.ukboxerdogs.freeuk.com/index.html

Please make sure that at the minimum both parents are heart-tested and clear.
The breeder should be able to produce the heart-testing certificate to prove the grading of at least the dam,
also the sire if they own him.
Heart-testing must be done by a vet that specialises in cardiology.
Grades considered clear are 0 or 1.

Good luck in your search :)