Hi twinny,
I dont have a clue about what costs are, if any, as there may be exclusions for certain age groups....but i would contact you're local council and ask them which dept to speak to in respect to this. They will put you in the right direction.
In the meantime, just ask you're neigbour politely if they can always remember to keep you're driveway clear, as you find it hard to pull out of it......and that they will not be botherd as a result to move their car, if they do. ( They should'nt block you're access anyway, so that is something you can mention to the council dept you deal with.
Best of luck to you, and you're husband, my lovely
yogi