Telgraph is running a story that Tony Blair was persuaded by Cardinal Murphy O'Connor not to announce his conversion to Catholicism during his visit to the Holy Father.
The following paragraph might indicate he has already been recieved into the Church:
Despite being asked by Cardinal Basil Hume, the previous Archbishop of Westminster, to desist from receiving Communion because he has not converted to Catholicism, Mr Blair received Communion from Fr Michael Seed while he was at Downing Street and from Fr Timothy Russ and Fr Walsh at Chequers.
This morning I heard an interview on BBC's Radio 4 with Sir Stephen Wall, the former Press Advisor to the Cardinal, who had previously advised Blair denouncing much of the Church's moral teaching, especially on abortion and on sex and sexuality. Interestingly the interviewer seemed to think that such teaching was "Infallable" rather than Magisterial, so it seemed did Sir Stephen.