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Seville.
You might want to research vegan. But 10yrs ago it was fine for veggies. We really loved it. Hot. Lovely river. Compact. Loads of interesting history and art stuff. Up there as one of the best city break spots Imo, very underrated.
Granada is another good shout. Colder (but not cold in the day). More alternative vibe, so probably better odds of vegan. Again lots of cool stuff. Probably a bit noisier over the weekend you you might want to double check accommodation location for that sort of thing.
Both really good value, beautiful, and a good change from UK grimness.
Edit: misread your previous post. If you haven't been to Barcelona, then you definitely should. More expensive than the above, but probably ahead in a list of which to see.
hugo7
Jonny69
Thinking about places for a long weekend away in mid October. Went to Lisbon at the same time of year a couple of years ago and loved it.
Requirements are: easy to get to from London, relatively inexpensive, vegan friendly, stuff to do and see (we're not beach holiday people).
Any left field suggestions?