Hi Dm0245,
We cannot advise you whether the property was your main residence for 100% of the perdiod of ownership or not.
You have to make that decision yourself, based of the facts of the case.
Where you have two or more properties, you are required to write to HMRC, to nominate a home as your main residence.
You must do this within two years, otherwise HMRC may make the decision for you, based on the facts of the case.
Please have a look here for more information:
Tax when you sell your home
Thank you.