Thanks for your comments, gents! It was a very fun project.
Whatz to say but all the above three times. :) :) :)
Plus I'm thinking "climb rate" is zoom, zoom, zoom.
Unfortunately, due to the weight and stickiness of the Bolls-Boyce Wintergreen engines, climbing was a bit of a problem which is why the Twirlwind wasn't able to intercept the balloon.
Brian da Basher
P.S. This model is proof of the lengths I'll go to to save a nice bubble canopy for the spares box!