Yes these kind of situations cause a headache. If Charles is sensible he will say no to AndrewI think all her children will do, plus male grandchildren & possibly her cousins.
I think I saw the procession to the abbey is just from Westminster though so much shorter than the route Diana’s took from St James Palace.
Be interesting to see what they wear as Andrew wanted to wear his military uniform to Phillip’s but was refused so none of them wore uniforms but then that was a lot smaller and not a state occasion.