Any chance your apprenticeship was managed by the CITB it could be worth checking with them
A few years ago I went looking at the
ECS site and was surprised how much info they had on me despite having never used the site before, the interesting part was initially I couldn't sign on / logon to get access to the site at the first attempt while it acknowledged my existance some of my details had been entered by others incorrectly when they set up their database from I believe were the JIB records, I had to call them in the end to try to unlock the problem as I was unhappy about them having my data on their system that I couldn't access after getting past a few jobsworth's I eventually found someone with a bit of sense that found my D.O.B. had been entered incorrectly stopping me accessing the site but they then wanted me to send in my birth certificate to validate my D.O.B., wasn't too happy about that and a few weeks later at an Elex I collered one of the head bods on the ECS stand who asked me to call him the following week and it got sorted.
So I'm wondering if the SJIB's database has lost your info because of a data input error, may be worth having a look at the ECS site