Sherwood Pinesin located in the heart of Robin Hood land, Nottinghamshire. The Kitchener trail is rated a red route although with the flatter terrain of Nottinghamshire it isn't as 'red' as many red routes in Northern England and Wales.
Make a day of it and you can visit the café, Segway around the wood or take to the trees on the boardwalks.
This video is a quality mornings mountain bike ride on the Kitchener TrailSherwood Pines (Red Route). Fantastic weather for deep winter in England.