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Whatever you use, you will need to consider the relative porosity (as well as movement / contraction / shrinkage) versus the soft stone and softer bricks that you are butting against (you can already see some spalling where the pointing is cement and has exacerbated water damage on the brick face).
Modern stuff is great, and works great with modern bricks & cement - not so much on turn of the century solid walls with lime mortar.
NotThamesWater
Howard
Presume something like this (first thing that came up) is good enough for the join between the wood and brickwork.
For the cracks in the mortar (render) itself assume I'm going to need something else, but what?