Back to work

I’m back from being away on holiday. I can never really tell you about our holidays beforehand for security reasons, but it is now safe to say that we went to Holt in Norfolk, where we stayed in a cottage one minute and fourteen seconds from the Kings Head. Activities included bicycling, railways and pretending not to keep an eye on Twitter.

Being back means that I need to draw diagrams. Oh dear. I have no ideas whatsoever, and so if you have any please feel free to post them below or in an e-mail. Thank you in advance, though I will also try to say thank you in arrears.