List of Foreign currency fee-free ATMs
Raphaels Bank: link to locations, Picadilly Circus & Canary Wharf (Note: to be confirmed if they debit your account in the foreign currency)
CitiBank: & Canary Wharf
Let me know of any others. Looking for ATMs where you can choose to be debited in the withdrawn foreign currency (without DCC) to make use of amazing rates.