Portugal Airlines Looking For An Airline Approved Cat Carrier (onboard From The UK To Portugal)?

Looking for an airline approved cat carrier (onboard from the UK to Portugal)? - portugal airlines

I moved from Britain, Portugal and has a flight booked with TAP Portugal, so that the cats in the cabin. Now I'm looking for an airline approved cat carrier, but have not found a still. It seems that most British shops only animal to large carriers in solids loading, but found no other airline carriers certified cat a cat on an airplane have.

Has anyone suggestions where I can buy in Britain?