Scoop

Hi I sold my main home and moved in with my partner until I found a suitable property. That was 3 years ago but I have now found somewhere at last. I own a second property 50/50 with my sister which has never been lived in or let out. It is for sale now. My questions are a) do I pay the extra 3% stamp duty even though it will be a replacement main home b) can I claim it back when second one is sold? Im aware I will have to pay capital gains on selling second property too.. thank you