Just to add to this, the site of Clapham pit is still extant, and with a few nice remains. One of those places I've been meaning to visit for ages, but never gone thinking it would be another fruitless search. So, nice to be rewarded with something to seeBarwicker wrote: and then there was Clapham Pit somewhere to the south of Garforth Golf Course, possibly under the M1 now.
