What you need to do if you are entering the UK from the Republic of Ireland
*Under the EU pet movement system, all pet dogs, cats and ferrets moving between EU Member States must meet the same animal health rules. From 1January 2012 the requirement is that all pets travelling from the Republic of Ireland to the UK should be microchipped, vaccinated against rabies and accompanied by a pet passport
*As both the Republic of Ireland and the UK have had no indigenous rabies for many decades, compliance checks on pets travelling between the two countries will not be applied. Pet owners travelling with their pets should therefore not experience any change on the ground from the 1 January.

No checks on this will be made between UK and Eire :-)