Went into a Wilko shop today and found they have a 'pick and mix' section for fixings. Stocked up on 6 & 8mm wing nuts, 5, 6 & 8mm penny washers and some 6mm nuts and washers to fill the bag. The amount of wing nuts and washers I got into a £1.99 bag will keep me going for some time.
Unfortunately the screws they have are 'roofing bolts' so not not so useful to me.
They do wood screws as well, just like the old hardware shop where you could get loose screws etc.
Regards
John