I thought the same regarding the MA1 jackets. They were still being worn in parts of Essex and East London in early 1970 but the Harrington was becoming more popular. They might have been from other parts of the country but I think I recognize one boy as a Chelsea fan. I didn't know Tina.
In late 69 early 70 there were quite a number of MA1s worn in S E London. I think this might have been due to batches turning up in local 'surplus shops'. The vogue for wearing them didn't last long, because by mid 70 we were all growing our hair and starting to wear flashier gear.