Did Debut Chester marathon Oct 2011, and Chester 2012, achieved 3:47:51 PB at VLM2012. Leeds half was 3 weeks after London and a PB gained 1:44:05.
In 2013, sign up for Gtr Manchester marathon and will probably do Leeds half again (2 weeks later) and Chester third time lucky.
Natural target for me is sub-3:45.