In reply to Gordonbp: as others have said, nut key, sling with screwgate, prussics.
You,ll also need 2 sets of wires
full set of hexed
Cams, sizes 0.5-6 double up on mid sizes
Micro cams (full set)
At least 25 pegs of various sizes
10 30cm quickdraws
4 60cm quickdraws
4. 120cm quickdraws
2 240cm slings with screwgates
1 pair of etriers
2 x 60m spare ropes
Flask of tea
Flask of soup (tomato)
Cheese sandwiches
(at least) 2 packs of tunnocks wafers
1 pair of wellies
& a packet of fig rolls.