Feckin - brilliant.
The clip on the seatbelt - also brilliant. Would a clothespeg work as well? I use pegs for sealing bags. Also handy for holding a nail or tack when hammering in.
If you are re-heating food in the microwave, make a hole in the centre - it heats quicker.
Use empty loo rolls to keep cables tidy when not in use.
If you haven't got a long candle lighter, light a stick of spaghetti to use as a taper.
Don't buy expensive cleaning products. Mix water and Flash All-Purpose (or own brand equivalent) half and half, then add some Zoflora in a spray bottle. For kitchen and bathroom and saves £££
Tile grout - make a paste of bicarb and bleach. Work in with a toothbrush and leave for an hour. Looks great.
If you have an iphone, put it in airplane mode to charge faster.
I'm sure there's more. This is a great thread 