Hi Bernard,
I can do better than that, I kept track of the cost and don't mind sharing it:
concrete 300
rebar mesh 60
shuttering timber 30
dpm 30
frame timber 280
door and windows 150
sheathing osb 155
screws 50
roof deck+firings 150
breather membrane 35
insulation 195
inside paint / floor paint 60
corrugated steel 220
epdm kit 290
fasica boards 50
gutters 35
electrics 200
shiplap cladding 170
Which comes to £2460. There were definitely some small items that I didn't count, but on the other hand I've got enough left over materials to build a small logstore type structure for keeping a chimnea/wheelbarrow etc under.
I could have put a sectional concrete building up for about the same price, but it would have been damp, had no insulation, and they look rubbish. Plus I wouldn't have had the fun of building it!