Tim had developed an interest in leather during his early years, mainly through seeing the odd leather clad biker passing through the small town he grew up in. Being a teenager in the pre internet years meant there was little information or support for Tim to access about being gay, especially as the cruelty of Section 28 imposed by the Thatcher government meant it had never been discussed in his school years.
Those adolescent years were a confusing time, not really understanding what it was to be gay, let alone understanding that being aroused by men in leather was totally normal. As was having desires that went beyond run of the mill sex that others seemed totally preoccupied with.
The struggle of working out who he was and balancing it with family life meant Tim hunkered down and realised his escape from the parental control and stifling nature of small-town life could come by going to university. The combination of wanting to go far enough away from home to have freedom to find out who he was and also have a vibrant gay scene meant London was the obvious choice.