Put your back into it, that's it (say's she whose OH did it
)
When they deliver it in the big tipper truck you can ask them to either leave it in several hillocks along the driveway or one big stripe down the middle and then just get to it. There must be a couple of 5th/6th form schoolboys nearby who would spread it about for you for £30 each. A big shovel each (rather than spade) and that's it.
If you drive your cars over that for a while (couple of weeks) to compact it before you put the gravel on then it won't mix with the gravel. Best to lay your gravel in not too thick a layer, then in another 6 months/year spread a topping load to fill in the most used areas/dips.
The £260 was for the hardcore, the gravel will be extra. We're going to get ours from a quarry rather than builders yard, it'll be cheaper. I don't think their quote was out of the ball park if it included delivery, labour, hardcore and gravel, but it could certainly be done quite a bit cheaper if you don't need to get it all done in a weekend.