I am wondering whether this could be G-AZYC Cessna 188.
This was owned by a Lincolnshire company and shows on G-INFO database as destroyed on 5/12/1983.
There is no record of this accident on either the AAIB or Aviation Safety Network databases, probably as it happened so long ago.
There are quite a number of Pawnee accidents and one or two Cessna 188s on the AAIB database, but none occurred close to Grantham.