I haven't got the answer! It was from the last programme and, as I said earlier it was on in the background

But... I think the A & C monument is the V&A Museum... and the statue opposite was re-gilded in the last couple of years...
Is there a detective series set in Suffolk?
I have a cunning plan... I'll get the answer off the iPlayer listen again OK

Right.
Mars = red planet, correct
A&C monument = red house, correct
That leaves the Suffolk bit and the prizewinner. It's not Doris Lessing, although the team were going the same route if it's any consolation. Try a different year.