He could easily have spared half of it for CAS, and indeed I'm surprised that no career-conscious junior officer offered to swap ties....
If it is Dalton to whom you refer to as CAS then you're a bit behind the times as he hasn't been CAS (or in the RAF) since 31 July 2013. Of course this means he no longer has a (free) PSO / SO / ADC / House Steward etc to remind him which uniform is required when. Perhaps the dress regs don't apply to retired officers.....
Edited to add ....
Just had a look at his bio. He is retired but
Dalton was appointed as Honorary Air Commodore to the RAF Regiment on 21 September 2013, in succession to Air Chief Marshal Sir Richard Johns