Natural remedies:
-- prune juice stewed overnight (and prunes removed)
-- peppermint tea
-- Senokot
-- keeping up good water intake (2 litres a day if poss)
Medical remedies:
-- movicol
-- glycerine suppositories
So far I have used senokot myself, but I do have a small supply of Movicol and suppositories in the back of my medicine cabinet in case things get, errrrr, desperate !!