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Get a reliable firm to do this.
Some parts of the UK have driving rain, that is a risk.
And there is a risk of damp bridging too, the wall pointing has to be in good condition and may need waterproofing barrier transparent paint on the wall.
We had it in the rental and it seemed OK, but, worth investigating properly.
JWestland
We've got hollow cavities so I'm going to look in to insulating them as well