I'm pretty sure it is down to arthritis rather than the cancer as the pain is infrequent and usually only when lying down.
Unfortunately that means very little sleep and hence the need to cancel as a 3 hour drive, 6 hour meet and 3 hour reverse drive after a night of no sleep could prove to be somewhat dangerous! I hope that after Friday I will be in a better state and will look to organise another day within the region ASAP.