Yes of course the need for air support is a bit of a "how long is this piece of string" question, but there must be an answer to a) assuming that it's a similar requirement (if not scale) to Afghanistan, and to b) assuming that your enemy is an Iraq 2003 level of threat.
As soon as an enemy has a functional IADS and significant AD aircraft, presumably it's now a 'No Can Do', as an autonomous op.
If you prefer, you could answer a different question.
How realistic is it to assume that a six squadron FJ force would be adequate to support a) or b)? How limited would those ops have to be for that size force to be adequate?
Is the force size commensurate with the size of the Army, or with stated UK aspirations?