Hello and thank you for allowing me to assist you.
These rules (called ‘temporary non-residence’) apply if both:
From what you have posted you are under ‘temporary non-residence’ if you come back in 2016.
You don’t have to pay Capital Gains Tax if all your gains in a year are under your tax-free allowance. If not then yes, the gain is taxable in the UK based on your not being absent for the needed time unfortunately.
That is correct