Follow-up question: what was the state of the Scottish Parliament at the time, and did it have any interaction with or input on the decisions made by the English Parliament & Crown?

It's often said here that there's always more to say on a given subject, and that's true, but in the meantime, you'll probably like this earlier response to the same question, though limited to Scotland, from u/sctlndjf:

What role did Scotland play in the American Revolution and what was the general opinion like in Scotland of the war?