Are you in Bath? Yellow limestone and all that?
Sorry missed your comment no the bricks are standard LBC, this side of the house gets the most weather and these bricks do seem rather porus.
just give him a basic specification of how you require the work to be done
I get that but as a layperson its difficult to come up with a spec to match, the raking out I understand but as for the mix and finish I'm a bit lost.
successfully done by a diyer with the required attention to detail
I would consider but not good with heights.