I forgot which challenge chat we are in here! I ought to add that I'd like to keep the Leighton Buzzard rides at 100+ km to take full advantage of the flatter terrain down there. Also, it is a long way to bring my bike for a 50 km ride. So, could you bear that in mind when planning your route? I enjoyed
@shirokazan's 2 metric century routes and it would be interesting to see what you come up with. (He may have already been working on a 3rd route so it would be worth comparing notes with him.)
The first 2 rides were pretty much west and south-west of LB. I have ridden some of the roads round the west side of Milton Keynes. Perhaps you could come up with a 100 km route heading out of LB south of MK and north of Luton, towards Bedford, but trying to avoid main roads and towns as much as possible?