How can you make explosives using household materials?

is it possible to make explosives using things around the house? i dont mean just high explosives but deflagrants also. by "things around the house" i mean without any trips to the chemist for nitric acid or down to the industrial yard for premium-grade potium nitrate. can you tell me any recepies and if anything needs to be refined, how it can be done? also is it legal to make explosive material in the united kingdom?