But there are a few cases which are very difficult to explain to HO.
For example:
Employer letter says I'm on paid leave on 29/11/2012 - My own absence sheet says I was absent from the UK from 29/11/2016 (I took a late flight departing at 11pm and I was at work during the day) and the flight landed in my home country the following day so my passport got stamped on entering my home country on 30/11/2012
So there is a conflict between my employers letter and my letter and there is a conflict between my letter and the entry stamp on my passport...

There is no stamp for leaving the UK from Heathrow Airport. Does HO somehow have a record of this?
I cannot prove this because I don't have plane tickets anywhere at all - My application is tomorrow.
What would you suggest?
Thanks