I picked up a passport form today.

It tells me that I must provide a photograph of myself, taken within the last month.

And informs me that this photograph must be 'free from copyright'.

So: I need to go back in time, persuade a photographer who died before 1938 to take my photo (as it has to be a colour photo, I'd better get her or him to take it on my digital camera, and to print it out while he or she is here), then they have to go back, and slip it into a secret drawer in my writing slope, so that I can discover it yesterday and put in the envelope to HM Government.

I might write and ask the Passport Office where I can get a time machine from.

I wonder if I can choose who will take my photograph.  It would be fun to chat with Fox-Talbot, but I bet everyone asks for him, and he's too busy. 

Olive Edis, maybe - she could bring her own colour camera (http://www.telegraph.co.uk/news/3160527/Early-colour-pictures-by-pioneering-woman-photographer.html).