harry, you aren't getting two conventional carriers, you are getting two STOVL carriers. In fact a Nimitz class or Ford class can carry twice as many planes as one of your QE class. So its not really two for one.
They will need to be followed by fleet oilers.
500N. You are writing about the Enterprise carrier group. Other naval assets on their own went out to the area near New York and Washington on command of senior officer present afloat until things were more well understood.
Carriers can also do amazing humanitarian things like help out coastal towns with fresh water and even electricity. USS Lexington, over 80 years ago, pulled up to a town in Washington and plugged in to their grid providing power for over a month while repairs to generators ashore were done.
Might have been cheaper for UK to just bye a few MISTRAL class french ships. Maybe even picking up the ones the russians want to buy.
I think if you want to compare ships (back to the other poster) you might compare the amphibious assault ships , also capable of carrying F35 or currently carrying Harrier.
I'm sure the new carriers will be enjoyable enough for a cruise of the med.