We didn't have a phone when I was a kid, but I remember our Dentist in East Ham High Street had a Grangewood number. Not sure where the name came from?
In fact when I was in junior school, I only remember one friend in East Ham having a phone and we thought they were posh

I still remember it, although will just post part it. - 552 **22

I remember there being a phone box just outside Gooseley Park (Gooseley Lane entrance) we used to mess about with it (not vandalise it!) I remember if you dialled a certain number and put the phone down it would ring - it was probably a test number.
I remember being told that you had better be careful messing around in phone boxes as the operator could lock the door and send the police round

(one of us would hold the door open just in case it was true!

)