Trading / Capital Gains Tax Question

I want to start by saying, I'm from the UK naturally and I have been trading profitably in the UK for a little while now. For the next few months, I will be travelling around the Mediterranean/Aegean. Which jurisdiction will I be liable for CGT in for my trades, does it depend on where they are bought/sold?? For example, If I was to fly out of the UK on a Monday and buy X amount of Y stock, and sell it on Wednesday when I'm in Turkey - who will I owe taxes to? Will it be my home country/country I made the trade in or the country I sell the trade in? Similarly, if I was to place a trade in turkey, but sell it a few days later when I get to say, Greece, will it be the UK, Greece, or Turkey? Are there any other things I need to take into account?