DEFRA does not produce Ordnance Survey flood maps. The Environment Agency publishes its maps showing the most up-to-date information available on areas at risk of flooding on a quarterly basis. The next date for publication is the end of March 2010. The map and publication is funded by grant in aid from DEFRA.
DEFRA is aware of a project initiated by Norwich Union working with Ordnance Survey to map flood risk, but this project has not been funded by DEFRA.