Willesden Cycling Club are running Reliability Rides in the Chilterns on Sunday February 19th. Race HQ is Chalfont St Peter. The format of a Reliability is similar to an Audax, you ride the road with a target time to meet or beat. These rides give a good early season workout and the 100km ride is reasonably challenging.
Full details and online entry can be found at
http://www.willesdencyclingclub.co.uk/calendar/reliability-rides/.