Pretty much that's right for peacetime, but make it two escorts than a destroyer and frigate. We've seen the RFTG deploy for the last 3 years (I think) with a pair of frigates without a Type 45 in site.
That's not to say I think there shouldn't be one, there absolutely *must* be one at least.
In a RFTG configuration, add in an LPD, LSD & RoRo. Also there's no guarantee that any of the accompanying frigates will have a towed sonar array, statistically it's favourable 8/5, but there could easily be only one.
The Queen Elizabeth class seemingly has an aim to be able to throw up a comprehensive ASW screen by herself alone.
Oh, also learnt that the Army Air Corps now has a requirement to keep one regiment of Apaches at high readiness consisting of two squadrons; one to support 16 Air Assault Brigade and another to support the Queen Elizabeth class. A current AAC squadron consists of 8 aircraft, considering availability that probably results in 6 Apaches ready to go.
I like Apache, incorporating them into the air group keeps the F-35B from *needing* to do CAS for a good chunk of scenarios. They'd need to be stowed in the hangar.
That's a thing, considering how mixed these carriers are supposed to be, I hope the RN gets used to keeping marinised aircraft on the deck unless maintenance is required.