I've decided to run this one again, previously mentioned
here. Abandoned airfields and secret fallout bunkers - what more could you want? It's a nice 52 miles with some lovely rolling hills, although the last 15 miles are mainly downhill (honest).
Assuming it's not foggy like last time, there are some spectacular views of Aylesbury Vale, and there should be lots of soaring red kites.
The approximate route is
here starting from Tring Station at 10 am. For any Londoners, trains take about 40 minutes from Euston. Lunch will be at the Little Italy café in
Haddenham.