Thanks for the replies. I built this in summer 2021. There were no frosts for at least 6 months after it went up.
Yes - it is a retaining wall in places, but the mortar has failed where it is - and isn't retaining. Behind the visible brickwork is a concrete block wall (I put this up at the same...
I put this wall up a couple of years ago. Comprises 'Mayfair Yellow' handmade bricks topped by engineering bricks. Mortar mix was 4:1 soft sand to cement.
Bricks, sand and cement were purchased 'new' from a local Builders Merchants. Cement was Bluecircle Mastercrete (yellow/blue plastic bag...