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Thanks. It looks kinda simple really, they're not too bad, just pitted and a bit crumbly on the surface so I figured I could just fill with a product and smooth over with a trowel to make it decent but far from perfect. Once painted it'll probably look a lot better.
deleted-
Finding something that bonds to the stone is likely the trickiest part.
Cement will bond, but if any water gets between (which will invariably happen, no matter how careful you are), the sill will degrade far quicker than without.
The lime mortar companies are usually good to talk to - they've lots of experience, and happy to talk. Try the chap at Mike Wye, or Conserv themselves.
NotThamesWater
Probably , depending on what you need doing.
I've used Namurian Rock to harden crumbly stone (after digging out the worst of it).
I had planned to rebuild with Conserv Repair Mortar (using a box frame), but ended up getting someone in, as I needed the sills ground down to create a runoff.
The repair person actually ended up using a lime mortar mix, with cement added - I think that was a bad move, but time will tell.