O2 UK IMEI Barred for iPhone 5

Hi there everyone.

Anyone offering O2 UK IMEI Barred iPhone 5 service ? active service at the moment.
I need it bad because i just bought a used iP5 that was barred, :(
Please let me know ASAP.
Do remember we are talking about an iPhone 5 !

Thanks.

Erik aka MuggeGHQ