Our house was built in 1910 and we are selling it. The buyers want to get
the drains checked out using a cctv thingy and that's fine by me except I
can't locate an access point anywhere.

Where I suspect it *might* be is undernieth paving stones and 2 inches of
sand as laid by the previous owners. (I know this from removing said paving
stones from the garden and discovering the original black bricked path below
it - much nicer tbh).

Without actually digging the whole lot up just to look, is there any way of
determining the direction a drain is taking? To make an educated guess as to
it's location.

Or, could it be possible that there is no access point at all? I have looked
on the neighbours side and they don't have one either.

Thanks
Rich.