@cyril sneerAt the end of the day it's something you and your wife have got to sit down and seriously discuss together and decide what's right for you both, it's no good relocating if one of you is going to be miserable, the same applies to staying here.
Fellow members of this forum have their own opinions, but many of them will muddy the waters.
My wife and I seriously discussed relocating some years ago, the trigger point was when I had a heart attack and she was worried about affordable healthare options, we went as far as staying in the UK for a while and my wife took her English test whilst there, in the end we didn't proceed, but we may possibly do so in the future.
What does the UK have to offer that Thailand doesn't, the NHS is far from perfect but it is there and available free of charge. Immigration rules are the consistent around the UK, none of this 90 day reporting lark and wondering what requirements an individual Immigration Officer will dream up next year, the rules are the same in Brighton, London, Leeds and Glasgow.
Yes, property is very expensive to buy or rent, power costs are through the roof, and there's things like Council Tax to factor in, I believe food prices are very much on parr with here, especially Western Foods, and yes Somtam is available, or at least the makings, wine is consderably cheaper.
You'll need to factor in the high cost of an initial application, well over £3,000 for the visa application and the NHS surcharge, this needs to be paid again after 30 months. There's the final Immigration fee after five years, but no NHS Surcharge, after which your wife would be on the way for a British Passport, some believe that is worth its weight in gold.
Despite the naysayers on here, many to return to the UK, many of whom believe they've made the right decision.
The biggest problem, as I see it, is Liz Truss.
Good luck with your family discussions.