Unless you have lived in the property - you will struggle to escape CGA.
You do have a large allowance and if done correctly, can bring some allowance over from a different period. You need to speak to your accountant - if you don't have one - seek an accountant that has been recomended by someone else. There are other ways around it but I would not like to advocate them !!!!!
If you had a lot of essential work done to the house, say to the heating system - that's tax deductable.
If you split up from your partner and lived in the house whilst you sorted out your differences and could show that you paid Council Tax, utilities at the property etc. I think there's a minimum period of time for this though, if you have previously rented it.
It all depends on how much profit you make - as there will be charges to transfer the name on the deeds. You need to sit down and work it all out and look at how the figures stack up.