Absolutely loved this FKT.
You would think that circling two of London's most well known parks would be relatively easy but not so. Route is quite overgrown in parts and so you need to take care to stay on the outside track.
There was a race taking place in Richmond and at one point I stayed with the race and didn't notice I had overshot the route - this was at the top of Richmond Park- so had to retrace myself and this caused the few minutes that would have see a tidy sub two hour
Unsupported attempt. Not a huge amount of opportunities to buy stuff once you are on this route but plenty of things if you are coming from a station - I went to East Putney and then the mile up to Tibbits Corners.