Hi mate welcome to S.O.C
If you don't mind traveling to Sheffield I'd recommend Sheffield Subaru Services or give Martin a rin there he's spot on bloke I'd say he would be able to tell you what it is, but at a guess with it skipping Id maybe say axel issue more or bearing problem. If you can jack the front end up you think it's coming from and give the wheel a wiggle from top and bottom and side to side if it has any play be a bearing.