Just had a bloke round about cavity wall insualtion and I've been told
that I can't have it. It's a stone built property with an inner leaf of
brickwork. Apparently because the inner side of the stone is jagged it
can cause damp problems. I'm thinking that I'd like to insulate from
the inside now so may get in touch with the plasterer who is due round
next week.

Can anyone please tell me...

What are my options? For ease would rather use dot and dab
plasterboard. How much is it? Is it worth it? How does it compare to
cavity wall insulation?

Cheers,
Matt