Reasons not to move to Scotland thread:
https://www.mumsnet.com/talk/scotsnet/3929125-Reasons-NOT-to-move-to-Scotland?reply=97375592
50k salary take-home, UK: 39,519
50k salary take-home, Sc: 37,979
100k salary take-home, UK: 68,557
100k salary take-home, Sc: 65,210
I would suggest not even looking if one of you might make more than 150k - I haven't bothered as you've said you would give up high earning careers.
Stamp duty 600k home, UK: 17,500
Stamp duty, 600k home, Sc: 33,500
Electricity is around 6% higher than in the UK, they also pay more for petrol.
Theoretically, Council Tax is cheaper, because it also includes water provision and water waste (and was frozen this year, which seems a terrible idea as services are already on their arses), but in practice, my eyes have popped out of my head at some of the bandings. E.g. a 3 bedroom, 1450 sq ft flat in the popular town of Peebles has a rating of G at at cost of circa £3.5k a year, whereas my current rental in NW England is an E and costs 2.7k a year, and is a 2240 sq ft detached house with 3 bedrooms, 2 reception rooms and about 1/5th of an acre of land. Our local CT is pretty much averagely priced, fyi.
I'm sure you don't need all the financials outlining in detail given the amount of equity you have, but just bear it in mind.
We live in the countryside now, and everyone around us seem to spend half their days being horrible to one another in the local Facebook group. Shrug. It's a rental, and as we've no intention of staying, it doesn't affect us. In our previous rental further south, there WAS no local community.
You should also do a search on talk/scotsnet for SNP. They seem to be almost universally loathed on Mumsnet and are dividing communities.
I'm definitely sure moving to the Highlands would bring about an absolutely idyllic lifestyle, but I really don't think that's something I would want to do in my 30s. It feels a step too far. Maybe ease in gradually, move to the edge of a town or into a village.