NutherA2 & Jig Peter:
Thanks for the correction
Post in haste, repent at leisure etc....
What a marvelous donk the Avon became, though - a true success. (Thread not withstanding, there were some!).
The Sapphire has always seemed the poor relation in comparison despite its many applications (and J65 license) - wonder why - perhaps lack of a developed reheat system? I suppose any future was put paid to when RR absorbed Armstrongs though...
Regards,
Frank