Flitwick Moor is managed as a nature reserve by the Wildlife Trust for Bedfordshire, Cambridgeshire, Northamptonshire and Peterborough. nature reserve ( natural reserve, nature preserve, natural preserve) is a Protected area of importance for Wildlife, flora [1] It is designated a Site of Special Scientific Interest [2] and lies between Flitwick and Greenfield in Bedfordshire. A Site of Special Scientific Interest or SSSI is a Conservation designation denoting a Protected area in the United Kingdom. This article is about the town of Flitwick See Filius Flitwick for the Harry Potter character Greenfield is a small Village about 2km (125 miles from the mid- Bedfordshire town of Flitwick. Bedfordshire (abbreviated Beds) is a County in England that forms part of the East of England region.