I would go to someone like classic line for all but the van and see if you can do a big discount. Also try A Plan in Farnham, Surrey, theyncan often put a few together.
Maybe explore limited mileages as you cannot drive them all. Also big tip, if you say garaged at home and it disappears off your drive then you are likely not to be paid out (it is fine if you are parked at a friends as that is not the norm)