Mr Fuxit wrote:
If you are living in the house when you do it, you will regret 'til the
day you die that you used a diamond disc indoors to cut through
brickwork! Any dust found by your wife in the next 10 years will be
your fault, all your friends will be told, in detail, about the amount
of dust you made,and your children and your children's children will
annually be told the story of the day when Daddy cut through the wall.
DAMHIKT.

The house is empty so no problems there.

Thanks to all for your input. I'll let you know how it goes.