1. Yes very nice for spins and manuals, due to Maneuverability.
2. Not sure, so just phone up and ask him.
3. Single-speed is good is you can't be bothered to faff around with gears, you can have them but you don't need to as you cannot attend comps for the meanwhile.
4. Not yet
5. not me and I doubt you will find someone as they are not very common.
All in all they are quality bikes and way worth getting and reliable.
Ps. If you find you want gears you can always just fit some on, because Leeson mech-hangers fit mechs and the Leeson K.I.S.S.S kit for either.
ash
EDIT: If you go up to the Leeson family home I'm sure Clive would let you test try any of the bikes. Well he did for me :P