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Heat gun, then sand the crispy bits off by hand. Don't forget to wear a mask when sanding.
As for the stone sill, you can get hand held carborundum brick cleaners from Axminster Power Tools, give it a good rub and the paint may be gone. I use them on very soft, old bricks for the house.
Aunt_Maud-
Axminster Power Tools
My late FIL appears to have kept these folks in business
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Ta. I did a few hours today and about half done (door with two small windows either side) - just cold scraping using a smallish flat bladed thing I bought from a market a while ago and is one of my most used useful tools. It's not very good steel so both blunts and sharpens quickly. On the main frame the top couple of layers seem to separate from the grey primer, but the trims around the glass seem to just have white gloss on them, no primer, and I can't get into it properly. I'm a bit nervous to use a heat gun around glass, but I think I'll give it a go tomorrow, I've got a glass shield fitting... It's a proper dogs dinner of a project, the new paint will have to hide a multitude of sins.
I gave the sill a cursory scrape and patches come away clean, but under the top layer is what looks like oil-based gloss. It an effort to avoid buying new things (and waiting for delivery) I'll try the variety of scrubbing and wire brushes I have (carefully).
NotThamesWater
hoefla
Also stripping a ropey wooden porch door frame, white gloss unknown age. Is nitromors better than sanding or heat gun when it comes to minimising potential lead fumes/dust?