Engineers huh... ask em to refit a battle ship engine-no problem ask em to press a few simple keys...different story!!! only joking mate.. No offence taken Buddy. I think we are in the Guiness book of records for most advanced warship. And yes I have removed and replaced Gas Turbines including Tyne, Olympus and Spey. Olympus are the ones as fitted to Concorde. Think i'll have it sorted tonight. Might be a late one though. lol