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In which case I must restrict myself to low walls only. Honestly, the structural engineers benevolent fund must be responsible for that load of cobblers! Any competent, and I stress competent, brickie is more than capable of going several mm higher without fear of instant detonation. I am probably the only person who takes the slightest notice of the Hastings Retaining Walls Act (I kid you not), I use it as a sales tool. No structural leech person is necessary or in the slightest useful until you are holding back something humongous or building something massively tall.
We've got two brick walls in our garden and I'd love to make it three - at the moment it's just a low slatted fence between ours and our neighbours'.
I think doing it myself is beyond my skill set (especially after reading that walls above 1.2m need a structural engineer's input) and getting someone in is probably beyond our budget.