I'm a Jetex nut!
It will work, but even with the most modern jetex equipment, jetex is still finicky and unreliable.
Get the Rapier solid fuel disposeable motors, they are what all the jetex nuts are using instead of regular jetex motors.
Estes motors give a lot of thrust VERY fast for a very short time, things will happen very, very fast after you ignite one.

Sams UK sells the rapier motors, go for it.