Perhaps it depended on the area. We'd had the modern type of number for years, since at least 1960s I think in the Manchester area, then Derby in the 1970s, Surrey in the 1980s, but when we moved to Wiltshire in 1990, the telephone numbers there had only just changed and the locals still referred to their phone numbers as - "name of village" 123.
Nanny Jan - I can remember our 'phone number in the 1940s (my mum had a shop so was allowed a phone, but it was a party line) the number was ALTrincham 1072, then in the mid 1950s we moved to a house and the number there was RINgway 3080. Strange I can't remember any other later 'phone numbers apart from where we live now.