Debenhams have a sale on on some Regatta waterprroofs - trousers and jackets. It says they are breathable, and they are thin, so they might be ok for cycling. Got mine in the one in Manchester near the Arndale centre.
Got some anyway, trousers £5 (only have XXL and XXXL so I had to get them too big but they'll do just to go over clothing) and jackets £9 (still got a lot of sizes left in the jackets), and they have a little bag with them to roll them up into. They are not with the usual waterproofs - they have a cardboard looking stand with the stuff on little shelves, so will not be on the rails. Worth a try for 14 quid for a set of waterproofs!
Got some anyway, trousers £5 (only have XXL and XXXL so I had to get them too big but they'll do just to go over clothing) and jackets £9 (still got a lot of sizes left in the jackets), and they have a little bag with them to roll them up into. They are not with the usual waterproofs - they have a cardboard looking stand with the stuff on little shelves, so will not be on the rails. Worth a try for 14 quid for a set of waterproofs!