Do you use a dip for scotch eggs? If so what's a good one?

In the UK you use HP sauce. The closest to that in USA is A1 Steak Sauce.

I think some sort of mustard or mustard sauce is traditional (or so I've heard.) But I think a chutney would also work really well. Speaking of which - lately I've been kind of addicted to this one, from South Africa: http://www.amazon.com/Mrs-Balls-Original-Chutney-470g/dp/B0001590KU Have to admit I originally bought it (at a local shop) because I loved the design of its bottle/label - but it really is wonderful stuff.

A mustard / mayo mix. Usually just a smear on the plate.

Jamie Oliver serves them with cheese and pickle. But any sauce that goes well with sausage and egg will work. A lot of places use ranch dressing or a thick mustard vinaigrette.