CycleOut London is affiliated to Cycling UK (also know as CTC - Cycling Touring Club). Cycleout members can join Cycling UK for just £24 a year, which is a great saving on the standard full individual membership. To take advantage of this rate go to CTC affiliate membership and enter 90069908 as Affiliate Club Code.
Cycling UK provides you with third party insurance cover should you cause any damage or injury to anyone while cycling (terms and conditions apply). You'll also receive access to a wide range of retail discounts (which can easily cover the cost of membership) and six issues of their magazine - "Cycle".