I don't think you'd meet the requirement but hopefully someone else can chip in?
If you flew out on 06/09/15 then you weren't physically present in the UK 3 years ago. There is guidance on this and you can find this on:
https://www.gov.uk/government/publicati ... en-form-an
Take a look at the guidebook and it says:
"You must have been physically present in England, Wales, Scotland,
Northern Ireland, the Isle of Man or the Channel Islands on the day 3
years before the application is received by the Home Office.
For example, if your application is received on 05/01/2018, you should
have been physically present in the UK on 05/01/2015.
Most applications that fail do so because applicants have applied even though
they cannot satisfy the residence requirement to be present in the UK at the
beginning of the residential qualifying period".
When did the applicant return back to the UK?