Q 1 In next doors garden, right at the left hand side, at the bottom, is
a tree, whose roots are pushing up the final 2 paving slabs of the path
that runs to our back gate.

If I lift the paving, how can I cut back the roots to let the paving
down a few inches to allow me to open the gate? I have already taken
about 3 to 4 inches off the wooden gate.

Q 2 A similar problem, I have had some of those dreaded Leylandii cut
down earlier this year and there are stumps about 2 to 3 inches sticking
out of the ground (about 4 inches in diameter.) How can I cut these
down, or should I just put a membrane down with pebbles on top to match
the rest of the garden and let nature take its course?

Dave