Clue No. 7
Flippin heck! This Ian Corrigible really is incorrigible!
After searching through 30+ names on a wikipedia list of Texas based sports teams there it appeared .. the Texas Rangers!
I recall very well the brief publicity surrounding this aircraft (early 80's) - I don't think any were actually delivered though!
How did I get to Texas? 'Ma bell' was evidently the nick name Americans used when referring to the phone company Bell System and from there it was a quick hop to Texas!
So ... No. 7 is the Texas Ranger - phew!
EoR