Not quite - he made a generalisation about Mancunians. You were specific about Worzel Gummidge on a tractor.
Interestingly, I don't think the book specifies where Scatterbrook Farm is, while the John Pertwee series was filmed in Kent, and the Mackenzie Crook version was filmed in Bedfordshire and Hertfordshire.
The only Manc equivalents I can think of would be Liam or Noel Gallagher, although I don't think Worzel would like being compared with two such scruffy individuals 🙃
As for tractors, the machines used in Suffolk are impressive bits of engineering, costing from £100k to upwards of £350k. As the John Crisp used to sing: "Hev yew evva sin a farmer on a boike?".