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I would suggest just using a large adjustable spanner and a bit of brute force, but failing that https://bikefix.co.uk/frame-repairs-0
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@PhilDAS (I think, or poss @Scilly.Suffolk) showed me a great way to diy fix this, involving a spare wheel. Worked perfectly for me, had the same problem on a steel bike. Am trying to remember where the thread was...
edit, found it - https://www.lfgss.com/conversations/304765/#comment13632250
I have a steel frameset with a bent rear derailleur hanger - any recommendations on where to get it sorted in London?
Also idea of costs & success rate?