The photo entitled "Canadian Bombers" doesn't really tell us any information about the grid square. I presume the title is a reference to RAF Tholthorpe from which four squadrons Canadian Halifaxes operated during World War 2. In total 119 Halifaxes were lost with many lives. The hut must be a relic of that period.
A wealth of information can be found by typing "RAF Tholthorpe" in Google.