I had the radio on the car tuned to BBC Radio 4 when I heard them talking about West Dorset landmarks I know well.
The programme turned out to be Ramblings which I have caught of various occasions. The format is that Clare Balding goes out with a group of local ramblers exploring the countryside around the United Kingdom. On this occasion the rambling group were members of the Labour Party who call themselves The Red Ramblers, they seemed to hail from the Weymouth area. The area they were walking in was just west of Bridport and concluded with an ascent of Colmer Hill.
The episode is available to listen to on BBC iPlayer (click here) and looking at the back catalogue available it looks like it will be there for the foreseeable future.