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I've used kingdomdatarecovery.co.uk
They weren't able to recover any data (the write head had pretty much physically scrubbed the disc surface) even with a donor drive that was 2 numbers away in the serial number.
They didn't dick me about though - they quoted £400 from the off, and only contacted me to ask if the drive had been previously opened, which would mean they would have to use a dirty clean room.
Once they couldn't do anything, they said so, and said I could have the drives back for £10 p&p, or they could dispose of them for me.
Good to know, I had a run in with a data recovery company (Fields Data Recovery) last year that I wish I'd researched a bit better in advance. Let's just say I wish I'd seen this site: https://data-recovery-blog.co.uk/ before using them, but it was a recommendation from a friend that I trusted (who said they did good things for them at a fair price).
I was strung along by a few "we're almost there" lines whilst I willingly and knowingly gave them more info as to how important the files might be to me. In the end they quoted a figure I wasn't willing to pay (£645+VAT), and so I rejected that and asked for the HDD back. All in all I only ever paid ~£7 to post the drive to them in the first place, they posted it back to me for free. If they had quoted ~£200 and just did it without the "almost there!" stuff I would have paid.
It was giving proper hardware errors before sending it (which is why I didn't want to make it worse by trying to do the recovery myself) and was not in any better shape by the time it came back.
In the end I found an image of all the files I was looking for on another HDD, so I didn't have to worry about this one.