At this stage he will have no further hand in Anglican Bishopric appointments and any possible unease caused in Orange circles in Northern Ireland now irrelevant, it would be a good time to formalise his position.
An added bonus being he could ask the Pope there and then for absolution for his sins…
UPDATE : The Observer’s John Hooper in Vatican City reports a Vatican source saying Blair used his last official foreign engagement before leaving office to tell the Pope he wanted to become a Roman Catholic.
“But, in talks lasting more than half an hour, the outgoing Prime Minister was left in no doubt that the Pope took a dim view of his record in office. A statement issued afterwards by the Vatican said there had been a ‘frank exchange of views’. Vatican sources said the Pope remained unmoved in his view that Blair had been wrong over Iraq. To an even greater extent than his predecessor, Benedict feels that Catholic politicians cannot separate their public lives from their private.”