There is a privately owned P51 Mustang which comes out quite often locally, I think it is based at Halfpenny Green airport.
About three weeks ago I was outside a friends house when we got treated to a mini aerobatic show directly overhead. He certainly wasn't holding back at all,nor the next day when I was out near the airfield.
I hung around at the end of the runway for about 1/2 hour hoping to video him landing on my phone,but he didn't return.
Nothing else sounds like a Merlin,well wound up in a shallow dive,and I will confess, it really does make the hairs on the back of my neck stand up, especially when you are not expecting to hear one whilst out in the countryside.