Following on from the previous post -- having done the Ely to St. Ives run, I filled in the last big arc on this map
showing the extreme points I've reached on day cycling trips from home, essentially all of it during the last five years.
The limitations of terrain, including the limited crossing points of rivers and major roads, mean that there aren't really any more significant big targets to aim for now :(
Update 7-Sep-2014: what is probably the last long ride of the season, to close that wedge to the east; while doing so, I found the junction at Brinkley and going past the pub that is now the Brinkley Lion familiar; just that it was the first time that the pub had been open as I went past. It is possible that in the past I went a little further that the new line on the map, but probably not too much.