The Estate owns:

One National Nature Reserve (the highest UK designation). Barnack Hills and Holes let to Natural England. This was an area quarried as long ago as the Romans but which supplied the stone for Peterborough Cathedral. Now a species rich grassland famous for the Pasque flower, rare orchids and glow worms. It is also a SSSI and a Natura 2000 site (a European Union designation).

Two woodland sites of Special Scientific Interest.

One grassland site of Special Scientific Interest; Racecourse Road.

Five ancient semi natural woodlands; woodlands which records state have been in existence since before 1600.

One nature reserve at Collyweston Deeps; another species rich grassland managed by Northants Wildlife Trust.