The answer may be joining TimeBank
a skills exchange network
free to join for anyone over 16
who lives or works in Hackney, London.
A time bank is a framework within which members can exchange their time in a reciprocal and meaningful way. For every hour's help given (say, helping someone paint their hallway) a member receives one 'time credit' which is logged on a computer and can be 'spent' getting help in return OR exchanged for a ticket to a social event / workshop / cinema or theatre performance. The skills on offer are defined by the members themselves.
Online info pdf
Online Joining Form
Sept 2012 link: