Defra (Department for Environment, Food and Rural Affairs) has a wide area of responsibilities - including the protection of the environment, Exports and trade, Science, Rural affairs, Economics and Animal health and welfare.
It is on the Defra website that you can find out about bringing pets to the UK.
Defra have a Pet Travel Scheme where, providing all the conditions are satisfied, you can bring some pets into (or back into) the UK without putting it into quarantine. The Defra website has essential information about the quarantine measures in the UK for animals that don't qualify for the Pet Travel Scheme.
Defra address and contact details:
Pet Travel Scheme Helpline:
Telephone: +44 (0)870 241 1710 (Mon to Fri - 8.30 to 17.00)
Defra Helpline: 08459 33 55 77
General postal enquiries:
Information Resource Centre
Lower Ground Floor
c/o Nobel House
17 Smith Square