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Our brick work is, to put it kindly, fucked. We're getting these chaps - https://www.eco-rend.co.uk/ - to put up 100mm insulation, with aluminium sills over the concrete sills, and then about a cm of rendercoat over the top. I think it'll come to about £7k, but should stop penetrating damp, and improve our insulation hugely. Also, the VAT is only 5%, rather than 20%, as it's an insulation product...
https://youtu.be/8KWW_mx8i4Q
I think is a video of the installation of what we are having done.
Are you wanting to insulate it at the same time? I might do if so...