He should be very grateful you care enough about the strength of your relationship to spank him, and for all the attention and help you are giving him to help him in self-improvement, discipline, and endurance.
As a large city bustling with people moving a mile a minute, London can sometimes be lonely if you live alone or have difficulty meeting new people.
The intensity and duration of these spankings also varies depending on the severity and nature of his infraction, but generally speaking range from mid to extreme.