I have an ex path - it had almost naturalised to weeds/creeping grasses
but i've dug it up now, raked off about 4 inches of stone chips and
what i'm left with is still very stony - to stony to get a fork in.
Where I've dug further into the ground there is a base of larger stones
(maybe 4" to 6" in diameter). Ideally I want this path to merge with
my lawn. I was planning to lay about 4" topsoil on top on the ground
as it is and seed that - it would be too much (manual) work to get all
the larger stones out.

When I say lawn I'm not looking for a carpet I'm not averse to clover
(for the bees) and daisies (for the kids) - I'm just looking for tough
grass which will extend my lawn right to the fence and do away with the
path which was impossible to maintain (just chips laid on soil - not by
me)

.... or should I forget about the grass and redo the path properly.
(But its not the most appealing just a straight line running the length
of my garden.)