Screwbox full to the brim with everything from 8x1/2" - 8x4" screws, red rawlplugs, penny washers etc. A box full of clips for 1mm - 10mm T+E, 5-9 white and black round clips. Sockets, switches, FCUs, RCD FCUs, dimmers, blank plates, patrass boxes, RCDs, MCBs, galvanised back boxes. 1mm - 6mm T+E and 3 core 1mm and 1.5mm in quantities of atleast a drum of each. 10mm earth, 4mm earth, coax, 3 pair phone cable, flex from 2 to 5 cores in 0.75mm and 1.5mm 3 core all of the heatproof variety. Hanks of sleeving (brown, blue and green/yellow) plus an assortment of tape. Chemical wipes, silicon, caulking, grip fill and cable ties. A bundle of YT2 sticky back trunking and the odd length of PVC conduit with a few adapters etc. Wagos, 5A - 30A block connectors, Henley blocks, choc boxes and 20A 4 terminal + 30A 3 terminal junction boxes. Batteries AA and 9V for test meters, radios and smoke alarms. MR16, GU10, ES, BC and linear halogen lamps plus a few lamp holders.
Think that's a fairly comprehensive list of most of the stuff on the back of my van. Each year when i do my stock take i'm generally unsurprised to find that there's nearly a grands worth of kit on the van plus there's always tails, light fitting, 10mm T+E, more breakers, conduit fittings and a whole host of other left overs in the garage.