I've finally got on the case and started to investigate this. There are a few different minibus companies but essentially they all do the same thing - pick up at Glasgow airport, drive to Fort William, stay overnight there, all 3 peaks, then drop off at Chester for the train back to London. Costs are between £100-£150pp for this.
Ideally we need 12 people to make this make financial sense. Though if we had a much smaller group then I'm sure we could get a smaller van rather than having lots of empty seats.
So, we need to figure out dates. I've set up a doodle poll with potential weekends: http://www.doodle.com/t3swvd8kskhcbbxc I've just put in the saturday of each weekend, but obviously it would be the whole weekend...
Also, good work, cheers.