This is (generally) a very nice route around the Oxfordshire countryside, with some great views. It passes through some very quaint villages (my favourite being Dibley!), passes some very nice churches (my favourite was Rycote), there were also some very inviting pubs (which I avoided whilst completing the route, but went to one afterwards for refuelling). Underfoot it was pretty good, plus a decent chunk on roads. I was doing this route for the first time, so took a map, but was heavily dependent in some places on GPX. There were some 'cheeky' choices/turns and I am pretty sure that I stuck to the route throughout.
The downside...some parts were very overgrown, with the worst being between Tetsworth and Sydenham.....unfortunately this lets the route down. Some parts were completely overgrown, with there obviously being no efforts this year to keep them clear. Some farmers do not respect rights of way and some of the footpaths were completely hidden, or very hard to locate/use, this was disappointing. I will report these areas to Thame and Wheatley Ramblers.
I can confirm that I did this unsupported. I ran it on my own, I carried all my provisions (food/drink) from the start. I did not jettison any rubbish, carrying everything back to the end of the loop.