On 10/05/2021 11:01, me wrote:
On Monday, May 10, 2021 at 10:59:14 AM UTC+1, me wrote: It's a standard stair handrail, oval in cross section, 7x5 cm, wood. Don't really know what more to add.
Oh I should have said the wall is a party wall so I can't do anything too heavy like knocking out bricks and so on.


You can chase out a party wall for electric cables so what you need to
do should be ok, unless it is an old house and the party wall is
only one brick thick (possible, but unusual).