Whilst the AH was shiny and new, we've really put it through the ringer for 10 years in Afghan. I wouldn't particularly draw a direct comparison to the sea king as it doesn't rely on war fighting tech to remain relevant. As for Tornado, I'm stunned that it's still flying so wouldn't really advocate that as a shining example either.
As has been stated, it's old, designed a long time ago and the support chain will not be there in a few years, then how much will it cost to "refurb" the kit then.
No they're not flying a lot are they?
I wonder why........