Dear Mr Cameron (or may I call you Dave?)
Sorry to bother you again, but I’m in a bit of a pickle and I need some help.
My children got piggybanks for Christmas. I have given them ten pounds each to start; my son getting a crisp £10 note and his little sister two rather grubby fivers.
It’s now pocket money time, and I only have enough for one of them. I’ve given it to my daughter, which was only right, as, obviously, five pound notes are smaller.
I have explained and explained to my son that this really is fair, but he just doesn’t get it.
Could I ask you to help me make sense of it for him?