[Ryewolf90]

Just pick a few of the sheet music titles and then search for it on eBay, that gives you a gauge as to what it's likely to sell for. A quick search on eBay said Gilbert and Sullivan is selling from anything from £2 to £20 per sheet.

I sold a VHS Recorder at a carboot at Great Harwood last week for £10 and a Slide Projector for the same price. Musicians still need sheet music and they're the ones that are more likely to buy retro stuff because it's collectable.

It's worth taking the time to research what it's worth, no matter how many, than to realise later that you gave it away when it was worth £100's and more.