Re: 0161 = block
Right. That's my cue for a short moan/rant. (Off topic but sod it, this is El reg)
London numbers, as stated, all start 020 from outside London or on a mobile.
The next bit is in the form of 3123* 4567 or 7123 4567 or 8123 4567
Outside London or on a mobile this makes no difference.
In London you don't dial the 020. You do dial the rest of that. So putting up a notice, or a leaflet or a sign, or the side of a van with 0207 123 4567 is just plain wrong. .
Don't do it
* the 3xxx was introduced when 7xxx numbers started to run out. Often, not always they're Central London (usually 7xxx). Usually, not always business numbers.
(Oh and never was one for Boddies. I much preferred Tetley's or over the other side of the hills Sam Smith. Just saying.)