I'm also part of one of the JP3 syndicates mentioned...
JP3 is actually more like £300 per hr and I currently pay £100 per month.
Economic cruise at 180kts indicated however I think the mil used 220kts, at the end of the day you wont spend that much time cruising about however! VNE is 350kts, flat out S&L you'll get about 300kts TAS out of a MK3, the MK4's and 5's are obviously faster but burn more fuel.
Agree Solo can be done in 5-10 hrs depending on your ability and we require 20hrs on type before you can carry pax.
We are looking for more members so PM me if you'd like more details.
Regards
UA