In the Name of Allah, the Inspirer of Truth.
Assalamu Alaikum Warahmatullahi Wabarakatuh

Please contact this organisation:
http://www.halalmc.co.uk/ or email: [email protected]

They will be able to advise you accordingly. They have a list of places you could try and lots and lots of useful tips!
Alah reward you for your prowess.

And Allah knows Best
Wa Alaykumussalaam Wa Rahmatullahi Wa Barakatuh

www.foodguide.org.uk