various tools inc box and socket type hub nut spanners
spare wheel
small trolley jack
hi-lift jack
collapsible axle stand
thermostat
throttle pot
wheel bearings
full set of track rods and extra track rod ends
wiper blades
hoses and amalgamation/hose repair tape
gaffer tape, heat shrink, electrical tape
coolant and fuel temp sensor
radweld
instant gasket
thread lock
super glue
chemical metal
copper grease
grease gun and spare cartridge
cable ties
fuses
electrical connectors
jump leads and extension cable
usually a spare battery but it's currently being kept warm in my hallway
voltage tester
water
pot noodles
gas cooker
water heater
various oils, car cleaner, brake cleaner, wd40 etc
straight bar
road grit, oil absorbent matting, mini shovel
various recovery straps, shackles, snatch blocks etc
waffle boards
jate rings
dragon torch
rechargeable Maglite
brake pads
brake pad clips
indicator and sidelight unit
some bulbs
nuts, bolts, screws, spire nuts
did have steering drop arm but now just drop arm repair kit
spare set of number plates
spare wing mirror
exhaust repair clamps and exhaust repair bandage
I'm pretty sure there is more onboard but I'm buggered if I can remember what else I have in the tardis.