Combining the twin British characteristics of obsession with property prices and innumeracy, Zoopla has got had a lot of publicity with their analysis of the variations is the price of property by the letter of the alphabet with which the streetname begins.
The most expensive is U and least expensive is Z.

But hang on a minute, aren’t U and Z rather unusual letters, and since there is no causative reasons for initial street letters to differ in price, isn’t this just a way of finding out average house prices by a random sample? and the smaller the sample the less acccurate the results?

I can’t find the number of streets in GB by letter, but I can for London. 5 letters have particularly low counts: I,J,U,Y,Z. Three of these are in fact amongst the two highest or the two lowest results.