54 12 17N 01 23 24W
Altitude 28 metres
Provisional estimate Class 2 if the matter of dead ground cover can be resolved otherwise Class 4
UHI, barely used local airbase, otherwise none.
Topcliffe seems to be a reserve RAF base used mainly for student/cadet training in prop trainers.
The ground cover problem
Google image shows early season rape fields coming into flower so it is late spring yet here we have a wild difference between grass generally and the rough airfield areas. Moreover close examination suggests scattered material from farm machinery, including in the met enclosure.
If this is recent practice during the year I think that warrants degrade to class 4.
Views, opinions and information welcome.