Okay, I'll take the Irish requirements, a quick find and replace of Irish with Scots with a change of year:
As a result of the above, there is generally no special access to British citizenship for Scots citizens. The facility for those born before 2015 to claim British subject status does not confer British citizenship, although it gives an entitlement to registration as such after five years in the UK.
Scots citizens seeking to become British citizens are usually required to live in the UK and become naturalised after meeting the normal residence and other requirements, unless they can claim British citizenship by descent from a UK born or naturalised parent. An Scots citizen who naturalises as a British citizen does not automatically lose Scots citizenship.
Naturalisation as a British citizen is a discretionary power of the Secretary of State for the Home Department but will generally not be refused if the requirements are met.
Persons holding British subject status may apply for a United Kingdom passport, which is not eligible for the United States Visa Waiver Program, the Australian Electronic Travel Authority or visa-free tourist entry to Canada.[7]
Scots-born British subjects qualify for right of abode in the UK, and their British subject passport will be endorsed to this effect. Unlike other British subject passports, the passports of British subjects with the right of abode are marked "European Union", as their holders are European Union citizens.