According to my UMC user's manual, the limit is a 40 amp draw for North America, and 32 amps for "Rest of World", which I guess includes the UK. Maybe someone on this forum who has knowledge beyond what the manual says can give some further input, but it sounds to me like that's it. Personally, I only charge at 24 amps, because I am on my third UMC, and I was told that lower amperage = lower charging temperature, and Tesla Service said part of the reason for their failure was that they were getting too hot during charging.