Brian, Teeter's ... Thanks for having a go chaps
I did a few assumption based calcs using a TAS of 300Kts against speculative hours utilisation per day/month/year and came up with circa 6 million nm but I was a bit out with total length of service
Even at a speculative 4 million nm ... that's some travel (if only AirMiles could be claimed !)
Bit of fun ...
Best ...
Coff.