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Phil L

wrote:
That's exactly what I needed to know thank you.

As frost pretty much rules out doing this for the foreseeable future,
can you do the pointing when there is frost about?

It doesn't need pointing if you are rendering it, but whichever you decide
to do will have to wait until it's been above freezing for at least 72 hours
as deep frost inside the wall will take at least this long to thaw.
Whichever you decide to do, you'd be wise to add some frostproofer and
hardener (B&Q or any BM) and only mix it in small batches as it goes off
quickly