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Price-wise, it's around the same, if you are planning on repointing & rendering in lime.
You may need to have the roof extended, however, to cover the extra width - this
adds to the price a lot, a far as I've found out. Also, nobody seems to know how this goes down with planning, although to be fair, I didn't go into that rabbit hole too deeply.
NotThamesWater
I dug in to it a bit, seemed more appealing than internal as you don't lose internal space. Less disruptive as you don't need to refinish everything either.
The trick would be finding someone you could trust to do it properly on an older property (or any property, for that matter). Suspect you'd also need planning of some sort. If we had a good excuse to do significant work to the house, I'd put some energy in to researching it more, as I can imagine just getting pointing re-done or rendering re-done would be painfully expensive too.