Hello Kay51 and welcome
As I assume you know from your post, the time after which a standard unsecured debt becomes statute barred in Scotland is 5 years. If you got the debt when you were living in England but have since moved to Scotland you can only take advantage of this rule if you have been resident in Scotland for 6 months or more. To read more detail about this see: Info about statute barred debt in Scotland. If this is the case and the debt fits the criteria then yes you can assume that is statute barred and communicate this to the creditor.