Just spoken to ClubMSV about this. The timetable showing on the website is misleading for the £99 evening - it is actually not a 3hr open pit session.

The £99 evening is actually 4 x 20 min sessions - that fit inbetween the tasters. The difference is that we only do the sighting laps in the first 20 min run - then the remaining 3 are just open. The tasters have sighting laps on every 20 min session.
Darth Maul - can you confirm the exact date/time of the 3 hr session you booked on? As MSV are telling me there isn't one on the 7th April??
Would those on the first list be happy with this 4x20min evening? - or prefer to find another 3hr session on another day? At this stage I don't think we'll find an opportunity for both 3hr and taster sessions on the same day, so it looks like we can't please everyone!