Thanks, I've taken on board your suggestions. The real answer came though when my daughter was round - I would pick something up and she would say 'bin!', 'bin!' really quickly and we got through it in no time. I don't mind getting rid of buttons, old cards, haberdashery etc, but I am loathe to bin anything my mum has worked on. For example she did a beautiful piece of hardanger embroidery, but had not got round to hemming the edges. So I feel duty bound to finish it off and then I will put it in the charity shop - well at least someone will use it and her work was not in vain. You might say keep it, but you won't believe how much she has created, especially patchwork items, over the years!
I'd be interested to hear how others cope when sorting out a loved ones work rooms!!