studying AC, and was unaware until now that the hotel was (presumably) built by the wealthy Claridge family of London, as the logo in the center of the note is the same as that used here, and I guess this is the reason you have a £50 note

Claridge's London is possibly the most prestigious hotel here. Excluding 'public conveniences' its one of only two properties I know that charge for use of the washrooms (Harrods is the other) and rooms can be booked for piddling little sums like $5000 a night