Originally Posted by
eternaltransit
That said, if the extra 2000 is a budget breaker, then I would advise the OP to actually fly Y, which would be around 1500 GBP for two, save your 2.5k (or 4.5k) and spend that on accommodations in Thailand - your 2.5k or 4.5k GBP will go a lot further towards enjoying your honeymoon than spending it on 24 hours in a nicer seat and slightly nicer food on board (and lounges that you'll have access to for 6 or 7 hours). 24 hours in a nicer seat, or an extra 3-4 nights at some of the finest resorts on the island...
These are well-made points.
Whilst I have never had cause to regret my own decision to fly in premium cabins, I am always very wary of actively encouraging others to do so IF they seem in any way uneasy about the cost involved. Everyone has different priorities and different budgets.