(17 Jun 2014, 7:36 pm)Marcus wrote Agree. Despite lots of rumors about what will become of the Pronto, I still believe the Red Arrows will receive some kind of treatment this year or if not, next, in which case it will allow their B9's to be cascaded onto a couple of other services - my guess being the Pronto and the Prince Bishops. I know B9s are much more powerful than the B5 engine (I'm not much of an engine whizz - but I reckon both the X21 and X9/X10 need a vehicle that will put up a fight horsepower-wise ), but do you think the B9 would cope on the X21?

I think the real question we ought to be asking is if a B5TL would cope on the "Pronto"... The B9TL should manage it no bother.