The whole issue of what you need to do is controlled by your local council and they are the people to ask.
In my area if you want to bring anything across a pavement, car, caravan etc then you must apply for permission and have a registered contractor do the job to their specification which includes depth of excavation and strength of surface as well as extending 1 mtr wider each side than the actual driveway to allow for turning in and out.
Same here, but our local planning department add that any surface laid must be porous. Tarmac is, but we had blocks paving, and had to have an approved medium, in our case powdered glass, laid as the base.