Yes, I know it was a long time ago but I was discussing this with friends last night (mainly five or more years older than me so they didn't do it).
When I started school in 1973 in the Midlands, we were taught to read using a system called ita (initial teaching alphabet). I could already read as my mother was very bookish but I remember taking a book home and my parents hitting the roof that I was being taught in this way. My mother complained to the school but we continued to be taught in this way and then later transitioned to standard alphabet.
I didn't have a problem making the transition to standard alphabet but I remember a few who did and I just wondered if anyone else did? It seems very odd looking back. I've attached the alphabet for anyone who's curious.