If you have a 20p coin with no date anywhere on the coin, you could get some nice money for it!
http://news.bbc.co.uk/1/hi/wales/south_east/8123749.stm http://reviews.ebay.co.uk/20-pence-piece-error-no-date_W0QQugidZ10000000012685256 I only found out about this today, and I have many coins waiting to be exchanged for notes at the bank.
I had 535 20p coins in my jar. Of those, only 33 were 2008 coins and of those, only 27 of them could have been dateless (but weren't). There are two designs of 2008 20p coins, you see.
Seems like I am unlucky today, but I will keep on looking as the payback is quite nice if you find one with no date.
£100 in 20p coins...that's a fair amount.
Tomorrow I count the 10p coins.
(I usually give the bag with 5p and under to a charity such as the hospital shop)