Murphy is on a programme called Hecklers on Radio 4. He is arguing against the non-dom rules or, as the Beeb puts it, 'that Britain should stop trying to woo the foreign super rich with tax breaks.'

I understand that the privilege of shouting at Richard, which is something many tax advisers will probably have wanted to do at some stage, goes to Mike Warburton of Grant Thornton and Michael Cole, Mohammed al Fayed's former spokesman.

Mike is a doughty defender of the rules as good for the UK, while al Fayed is probably the best-known non-dom, so both should prove a good foil for Murphy's arguments. There are two other guests, but I best not steal the BBC's thunder entirely by giving them all away.

Richard is already boasting on his website that he found 'considerable support' for his arguments in front of what he calls a hostile audience.

Needless to say, a full and unbiased review of who won and who lost will appear here on Thursday morning.