Neil,
I am fully aware of the windup problems with the Fv600 series. My friend has a Saladin and a Saracen, he drives them once a year from Derby to Dorset, and has done for 10 years. He is not afraid of working on them, both require a lot of servicing and repair before and after the journey. It is possible to drive your Stalwart anywhere you like, providing you look after it properly.
Incidently Ferrets also suffer from windup. I take mine over the grass at motorway service stations on long journeys.
Chris