How old is the Dyson? They do on-site servicing/repairs for a fixed price - £65 I think, and the engineer replaces the filters and anything else that looks dodgy while they are there.

I have a Henry, they are bomb-proof and all the parts are available if anything does break.

I also have a DC19 (cylinder) Dyson that I picked up off Freecycle (and another one I got for the accessories) - it seems people don't wash the washable filters and then throw them out when they inevitably lose suction! I can see why people like them, the product design is very nice, although they always feel a bit flimsy.