Hello and welcome to JustAnswer. I am here to help you. I will review your question and will respond to you shortly.
Thank you for your question.
If the house has been your only property and main residence before you buy the holiday park home, then provided you sell it within 18 months of moving out the gain will be covered by private residence relief and there will be no capital gains tax payable on the gain.
I hope this is helpful and answers your question.
If you have any other questions, please ask me before you rate my service – I’ll be happy to respond.