One interesting point is that HMG reserves the right to tax "Government Pensions" in the UK irrespective of where the Recipient resides in the World. My Wife was a College Vice Principle whilst I was an RAF Officer and although we are Resident in France our Pensions are taxed in UK.
I would assume that all ex UK "Government Employees" in Scotland would continue to be Taxed by HMG - which is of course paying their Pensions!!