A mate had a wedge in his bucket o'bits. Too small, 20mm diameter. Went to local bike shop, nearest was 22.something mm, no good. Tried me thread....looks like the Raleigh Shopper is the Old Imperial, the bits I tried today are Metrical! The search continues. In Oz they have "Hard rubbish week", you sling out all yer big stuff and peeps can come and take it, before the Council tkaes the crap. Always lots of bikes on the sidepaths, perhaps I will get lucky! More updates as they happen!