In particular, I'm struggling to understand what counts as the beginning of my 5-year period as I transitioned from Tier 4 to Tier 2 back in 2017. Here are my key dates:
- 18 Aug 2014 - I first entered the UK with a Tier 4 visa for a PhD
- 15 Sep 2017 - I finished PhD and started working and being paid as a researcher at the same Uni, while Certificate of Sponsorship (CoS) was in preparation. It was a transition from Tier 4 to Tier 2 that Unis do, or at least used to do back then, HR handled this whole process.
- 6 Nov 2017 - My CoS was issued
- 7 Nov 2017 - Tier 2 visa application is submitted. I have a letter as a proof
- 13 Nov 2017 - CoS has this as the "Work start", even though I was already working at this point. (BTW, my Tier 4 was valid for the entire transition period.)
- 6 Dec 2017 - Tier 2 visa application approved. I have a letter as a proof of this date
- 22 Dec 2017 - "Date of issue" on my first BRP card