This week, a fellow birdwatcher and I walked through a reserve that used to be a wasteland. For a hundred years it was used as a quarry and a rubbish dump but now it has been transformed into a large nature reserve. I noticed in the river backwaters the huge increase in pennywort which is covering large areas of the water.. It is hard to remove, and grappling hooks and muscle will be needed soon to remove it. The banknote collection spreads slowly over time until one day you realise this is something rather special.  Unlike pennywort, there is no need to get rid of it but, if you have notes to sell, I am but a phone call or an email away.