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Chandlers in Hampton (?) has a plek machine, or access to one. A mate of mine has sent a couple of guitars there to be done over the years.
I remember thinking about it once on one of the ones I built, and it wasn't as expensive as I was expecting. I wondered whether you'd be able to throw in a neck with raw frets in, i.e. ones I'd just pressed into the neck with no work on them.
Edit:
£150 for a fret dress
https://ccgx.co.uk/plek/
Or just get it plekked!! Is that the correct tense? Do you even plek in London? We've got a machine in Sydney and another in Perth apparently.