Grandmabatty
I had blown air central heating too, in the first house we had after marrying in 1981. It only worked downstairs and wasn't terribly effective.
Our first house had blown air central heating. It was superb . I have never had a house since that was so evenly heated. and where the system was so effective. Ours was a whole house system with warm air vents in every room upstairs and down.
The systems became unpopular because they were cheap and easy to install and became very popular with local authorities for council housing and because they they tried to economise further by failing to duct the heating to upper floors instead, just blowing air out at ground floor level and relying on hot air rising, which in small homes with small rooms and doors and furniture, it didn't.