Up at 7.00 am, down at 10.00 am. Slow descent due to inexperience of myself and Mark. Brian replaced naff bolt. Mark put in one of his own at triangular slot. I put in another bolt at triangular slot (dropping and losing spanner). Next pitches quickly rigged to bottom at mud wall level. Quick break for food - Mark went exploring (see later) and made bid for "Golden Boot". Brian had a quick look at phreatic level - strongly draughting downward passage to left leads to streamway and later water features - includes stalactite - "frig-rig" pitch to streamway. This leads to ramp. Needs another trip to determine if this passage goes. Started slow ascent - again due to us SRT novices, but speeded up noticeably towards end. Came out ~ 8.30. Dark before reached car park. Heavy rain, difficult drive. Arrived back ~ 10.20. Time underground ~ 10½ hrs. 144 phreatic extension - someone sketch please.