GREAT DOUK DIG: dug extensively in the 70s by the CPC, then in the 80s by the NCC who reached a large breakdown chamber. More recently by YSS / NPC / other friends, who I believe have an interest in it still.
FOOTBALL CAVE: drains to Goat Close Rising at approx NGR SD 77357910. Note, the CDG Northern Sump Index 1995 states on page 58 that the water resurges at Batty Beck Rising not much further down the riverbed. However in lowish flow Batty Beck Rising dries up when Football Cave still swallows a substantial stream. It is possible, but I think unproven, that BBR is a flood overflow to this system but the permanent rising is at Goat Close near the valley bottom. From memory there is a short article in a Cambridge University Caving Club journal from the 70s about BBR (i.e. the Shackleton / Griffiths era) but I can't remember whether it says that they actually did a dye test or just presumed it flowed to there.
If you want further information about either of these two then PM me.