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That 'Decorators Exterior' stuff will shrink by 10-15% as it dries.
It is water based and must lose the moisture to fully cure.
It also has only limited movement accomodation.
You are likely to find it has delaminated from one substrate or the other,
(depending upon which it sticks to worse), after a Summer.
Treat yourself, and the property, to something from the Soudal Fix All range.
The High Tack Adhesive & Sealant is available in white from Toolstation.
mespilus
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?