[Toucan]

UK 020 numbers are still 11 digits. They're only a different length if you omit the dialling code, which you can't do on mobile phones anyway.

[corin_]

Hmm you're right, I mis-remembered and hers is correct. According to Wikipedia there are some non-11 digit numbers: "almost all geographic numbers and most non-geographic numbers have 9 or 10 national (significant) numbers after the "0" trunk code". An example being:

  (016977)  xxxx 	Brampton

http://en.wikipedia.org/wiki/Telephone_numbers_in_the_United...