A commenter over at Damian Thompson's blog reports:
"Returning to our bus at Cofton Park we find that someone has given our driver a pile of commemorative Tablets to distribute. By the time he gets to the top deck our affable but somewhat puzzled driver is asking what is wrong with the Tablet as he cannot even give them away. Multiply that by 400 buses in each coach park"
Update: the link is now reset and the comment (above) can be found on the third page about 3/4 down.