Schwalbe Marathon tyres for the hybrid - terrible things, lasted a fortnight before being replaced with something that didn't feel like cycling through treacle and that had some grip in the wet.
A Bike Hut mini pump from
Halfords that was virtually useless and almost left me stranded.
Not my purchase, but not talking Mrs ND out of buying an Apollo Elyse. She liked the look of it in the shop but I had my doubts that it would be a pile of sh*te from the outset, which it was. Ridden four times and consigned to the back of the shed.