From Tesla website:- Owners may use the valet service at the main entrance from Portman Square or ask the parking attendant at the car park entrance to manage their Supercharging. The hotel staff are capable of providing this service free of charge
You can drive in from the backside of the hotel Hyatt Regency London - The Churchill. It is a narrow alley where there is a basement parking with a iron gate in front. the first Hour is only free and after that 6 Pounds per hour. I arrived 3 in the morning and the hotel personal was not aware of the existence of the charger.... But after couple of calls i got in. Parking skills required the garage is narrow!!!! The charger is in the far left and you have to take several curves to get the car on its spot. i think when spot 41 is taken it becomes a bigger challenge.