Thanks all for the warm welcome and advice.
So I've counted up and I have 4 copper washers which I believe are all there, but there is only one washer that has a little indent on both sides and it is this one which I thought there should be two of? That could be all of them, but just want to make sure before I do the reassembly.
SteveC - I believe it could be missing a washer between the bit driver and small bit driver or the bit driver and the bottle/can opener.
Ponch065 - that would be great if you could, much appreciated.