Billy cans= i don't bother I use either a small wok or a piella pan. both cost less than £2. I have used noraml cooking pans in the past.
Cooker= I use a gellert pocket stove @ £2.50 I could be posh and get an army one which are better made. I have used various types of hobo stove in the past.
Most cooking untilsils can be made up on site easiley, like flippers/fish slice can be made be even the most un skilled whittler, and tongs I use 2 sticks (no arguments about sticks now, we have had enough of that this week)
Torches = use basic supermarket cheap things with string around the neck.
Termarest=hey thats posh
I see nowt wrong with a wool blanket and silver sheet, it keeps me warm evan in winter wind, a cheapo foam mat does too.
Paracord= we use camping guy line as it cheaper and brigher coloured. The hammocks are on climbing rope that costs £2 per meter though I couldn't sleep soundly with cheap stuff.
you will need a good size tarp for the MK hammock, we use the group buy hex fly. There are some things i dont think can done cheap, sleeping bags, tarps and axes. That doesn't mean you need to buy granfors but don't get stuff from aldi and expect it to keep you warm or hold an edge.
Tescos do a play parachute that is 3 meters diameter, that is pu coated nylon. It cost a tenner and is one of the most versitile bits of kit we have. It has a vent hole in middle so it doesn't make for hammock tarp, it is also lurid colours. But we have used it as a bender, a bothy bag, a lid over a cooking area, and even a play parachute.