I want to do MBA in Marketing and I got offer letters from Bedfordshire,Bangor and Coventry.Which among these will be best.
Note-I dont want to work in UK after my MBA.I want to work in Middle east after my MBA gets completed.

None of these are accredited by any respectable accreditation organization (AACSB, AMBA, or EQUIS.)

As such, they won't have the same network - pretty much anywhere, but especially outside of the UK - as the more respected schools.

Why not find an MBA closer to where you want to work? There's the American University in Cairo, as well as a few emerging ones in UAE (SP Jain, University of Dubai, United Arab Emirates University, etc.)