In reply to robsykes1975:
I'd say putting a pair of age 10 waterproof bottoms then dying because you can't use them when you need them is the ultimate false economy..
I have generic Decathlon Quechua waterproofs if the weather is moderate I think I'm going to need them. Sure I could get some cheap lighter less rustly ones but mine are still functional so no need.
Super lightweight Inov8 see-through jobbies (bought on a voucher) if it's summer, mild and dry. Only problem with these is if using them at overnight on the Saunders, and you run commando (as do I), you can't take your shorts of to dry them and get away with just wearing your overtrousers. Well, I suppose you could but you might be banned for a different reason...