This definitely seems like the way to go Paul.
My 2014 Luxury is the same age as yours, now done 80k. I plan to keep it for the next five years, maybe longer if it's still going well. Not yet sure whether I'll bother with the Extended Warranty as there are reports it doesn't now include the breakdown cover. It's 100% mine, so even the odd big bill will still be considerably cheaper than the cost to change to a newer model (which will also be depreciating at a more rapid rate).
It's tidy enough to look decent if I clean it up, but is relatively understated and I like that. If it gets the odd scratch or WHY from being used on country roads I'm not too worried, so it's the ideal tool for the remaining few years of my full-time working life. It's still as roomy, comfortable and capable as it was when new, and it seems unlikely that whatever I get to eventually replace it will have a V6 so I'll savour my last few years with it.