Your best bet is to contact a Quarantine kennels in the UK for a quote regarding costs that end and a pet relocation company here for this ends fees.

It all depends on how many cats you are taking, the kennels you choose, how much of it you do yourself and whether you employ a pet relocator to take on all the customs & paperwork this end.

www.qatarpetrelocators.com should be able to answer some of it.