A glance at
The Airfields Of Lincolnshire reveals that, at its peak, Lincolnshire had 119 airfields. Some of them were well-found, like Hemswell, with hangars, technical and domestic accommodation, runways etc, but the vast majority were satellite airfields, with little in the way of large buildings, and merely grass strips. This sort of number was required due to the vast number of ac to be accommodated. There were huge numbers of bombers (and, of course, some raids comprised over 1000 ac), plus fighters and training ac, and the inevitable repair and salvage organisation. In addition, some of the airfields served as decoys, to draw attacks away from the real ones. As well as simply accommodating the ac, they also served to disperse them, so that an attack on one airfield wouldn't incur too great a loss.
They would all have been 'acquired' by compulsory purchase, or the land would have been 'borrowed' from the owner, to be handed back after the war. This was also the case for many large houses, and even pubs, which were commandeered to serve as accommodation for the squadrons (hence the lack of buildings on many of the airfields).
To put things into context, Lincs now has the grand total of 4 active airfields.