You will qualify for exemption from CGT for that proportion of the gain covered by the period from when you moved into the property in 2006 until you moved out in 2009 plus that proportion of the gain covered by the last 18 months of ownership. In addition, if you let the property, you will be eligible for letting relief which will be the lesser of :
2 the sum of the gain for the period you lived in the property and the gain for the last 18 months of ownership of the property and
3 that part of the letting period gain not covered by the last 18 months of ownership of the property which are exempt in any event.
Take a look at HS283 here for more information on the main residence and CGT.
I hope this helps but let me know if you have any further questions.
Hi - I meant to write 'I am now going to sell' rather than 'not' in my question. Could you please let me know if this changes your response?