Not integrated and not modular but....
 

For the cost of an Integrated course, between a few students Could one.....

1. Buy a complex aircraft (how much are they)
2. Pay an instructors Salary
3. Do the ground school
4. Do the G/s and flying exams

and have pooled aircraft left at the end ?

No. You do not have approvals to run a Flight Training Organisation for the courses. This is a requirement under JARs.

However if the aircraft was not too expensive you could do modular training, with your own (non-complex) aircraft for hour building (for the PPLs too if you had it on a public-transport C of A and can persuade an instructor to teach you in it. Come to Bournemouth and I'm sure I could find someone not too far away ;) ). Do your modular courses at an approved school.

In the long term that would probably save you money compared to a modular course, although more of the risk falls on you, I think, and the initial outlay is high. However for the price of integrated training 4 of you could do a modular course entirely and with the money saved buy a decent 4-seater for the combined saving, so the outlay is still not much compared to integrated training.