The car boot sale was held on the cricket pitch by the pavilion this year, hence the cordonning off of the hallowed parts of the pitch
in previous years the carboot was held on land on the other side of the canal, over the bridge, next to the coal yard which extends quite a way back, which I think is the bit PLW was talking about
My earliest programme is 1981 and that was at Broughton, so that's no help!!