British and Irish citizens (but not British "nationals" from Hong Kong or other places overseas) can fly within the British Isles with a photocard driving licence.
Other EU citizens can use their national ID card.
Everyone else still needs a passport.
yes
You will not require a passport to travel from Sunderland, England to Falkirk, Scotland.
Of course. You will need a valid passport.
yes you do im Irish
No.
No. You don't need a passport to travel from one part of the UK to another.
this question doesn't make sense as Scotland is in the UK. If you mean "do you need a passport to travel between England and Scotland" then the answer is no. Unless you are flying, in which case you will need some form of photo ID such as a passport or driving license.
He/She will need an ID of some sort, but not specifically a passport.
No visa for the countries of the European Union: valid identity card or passport.
It depends. If you are an English or Welsh citizen, then you can certainly cross the border into Scotland without any passport. It's all the same nation, the United Kingdom. If you are a foreign national, then you will need a passport to enter the UK, whether you are trying to arrive at (for example) Manchester Airport in England, or Glasgow Airport in Scotland. However assuming you gained legal entry to England, you can then travel around the UK as there are no border checks in between England and Scotland, or Scotland and Wales.
Do u need a passport from scotland via dunegal going by ferry
no - it's an internal UK ferry trip