Oops I've widened my driveway so we can get the family cars off the road, I had no idea permission was required but that wouldn't have stopped me, I did not drop the kerb or interfere with the path or road tho'
Very common to see this and I would be very surprised if planning were in place every time, this is a practical solution in some cases where multiple car ownership within a house was not considered by the planners at the initial stage.
You need planning if you widen your entrance to a public road. It shouldnt be a problem unless you try to sell your house, you will have to apply for planning or retention. Some of the councils will restrict you to a 3m opening.
Dishing the path is a whole different ball game, depending on the council.