I bought a house in 1999 for 150K. Left the UK in 2002 and became non-taxpayer until early November 2013 when I returned as a UK tax payer. We let the house out throughout that time and it was vacated by tenants in march 2014. We did not move back into it at any stage after leaving the UK. I bought another house as our main residence in December 2013. The original house is about to be sold for £290K. How much relief will I get on the capital gains, having lived out of the original house and country for the best part of 12 years?