It is already a requirement for every dog in the UK to be identified by a microchip and its details to be recorded on a recognised database. This includes dogs imported from outside the UK. Defra will shortly be issuing a call for evidence on whether to introduce compulsory microchipping for all cats in England. Furthermore, all pets (cats, dogs and ferrets) entering Great Britain on approved routes have their microchip scanned and recorded by the carrier at the time of travel.
We do not consider it necessary at this time to introduce an additional database along the lines proposed.