Just to clarify.
"We intend to use it as a holiday home for the time being and eventually retire to it. Anyway firstly the property I am looking at is about 4 years old and semi rural."
Are you saying that you have actually identified a particular property ?  If so, was it offered by a local Estate Agent ?  The most important first step is to check the bona fides of the agent.  Once you are sure about that and also the classification and legality of the place you're looking at, I'm sure some of the members on here can help with advice on the next steps.
Happy for anyone else to jump in here.