I need to replace two sinks (kitchen and utility). Due to the new ones
being 30mm wider (front to back) than the existing ones I need to enlarge
the holes. I do not want to disturb the worktops and tiles so I would like
to cut them in situ(?). Has anybody ever done this and if so what is the
best method. I have a range of power tools but because of the distance from
the wall to the back of the sink I cannot get in with my router or jigsaw.
I have a Rotazip type tool that may do it but I don't think the cutters in
these things are up to cutting 40mm thick worktops. Can anybody offer any
advice or am I looking at a hand saw job?

TIA

John