Last month whilst running around the Isle of Portland’s coast path, I was struck by what a great mountain biking route it would be; winding singletrack atop sheer cliffs, rocky tracks through abandoned quarries, sketchy moves over huge blocks of quarried detritus, brake-melting descents down disused quarry inclines.
Unfortunately, the coast path is not a bridleway, so it is not possible to ride it.
If Nicholas Crane and his cousin could cycle up Kilimanjiro I am sure that you could cycle the coastal path. Sorry to hear about your flu. Training hard can make demands on glutamine (an amino acid) reserves in the gut leading to a depressed immune system. Glutamine powder is available to take in small quantities; trying to eat small nutritious meals and natural yoghurt and honey can help.
Many thanks, I’ll look that stuff up.