Heaved the gravel bike out of the shed, put some more liquid in the flat tubeless tyre (a problem round the rim, so had dumped it in shed and ignored it - like I do). Found it tough going back on this bike off road, the forestry tracks are even worse than our local tarmaced lanes, which are worse than most riders idea of gravel; was shaken to pieces on any downhill and uphill pretty rough.
Finished with 20 miles and 2500ft, but surprisingly hard after weeks of nice road riding.