Depends on what you regard as Northern Scotland! Some people regard Aberdeenshire, where I live, in the same category as the Highlands when it comes to postage for items! All of the Council owned sites in Aberdeenshire (which generally are excellent value for money) close at end October. There are some sites open up here but they tend to be CL's where services are limited and, I think, you do have to be a CC member to gain entry. We are looking to get away for New Year but it is always depending on weather!
Cheers
Graeme