IIRC there is a free landing thingy cut out token thing in Pilot Mag for both Fenland and Leicester.
Without the land away, I took my dad over to Selby then up North to Wombleton over to Scarborough, down the coast, then cut back across near Hornsea.
Can't quite remember how long it took, but he enjoyed it. If you want to land away, you could always do that, and drop in at Sandtoft on the way back? Would fit nicely into four hours anyway.
Regards