CGT non residents

[kanrent]

Hi i bought my home in 1987 lived there for 15 years as my only home, in 13 July 2002 i rented it out and went abroad to live on the 25 July 2002
I contacted HMRC to find out what the official date was that i became non resident they told me that i became non resident on the 6 December 2003 i have my original passport which shows that i left the country on 25 July 2002 and all the other country's stamps that prove i didn't spend more that 60 days in the uk in any one tax year since July 2002.
my question is when HMRC works out my capital gain will they use their official non resident date or can i dispute it by showing the dates in my passport to prove my absence from the uk
thanks for any help

[maths]

It may not matter. As a non-resident any CGT charge on sale is in principle based on any gain from market value of the property as at 6 April 2015.

Depends upon the figures involved.

[kanrent]

IM conserned about the year before I became non resident of they take it Frome their official date and not the date I actually left the uk

[AnthonyR]

From a CGT point of view it doesn't matter.

You are subject to CGT on the gain from 6 April 2015 (prior to that non-residents paid no CGT on disposals).