i am in the same position and have explored the possibility of registering our uk marriage here.Theoretically, we could ignore our marriage as it is my intention to convert to a reirement visa as soon as I can. I will have no problem in getting a visa based on marriage at my local Consulate as they don't care what my wife's name is in Thailand. However, I want here to have my name so that when I die there will be fewer complications relating to inheritance.
we have been told different things by different people and in the end thought "fuck it", the goalpost shifting morons seem to want to make farangs jump through more and more hoops in order to satisfy their bureaucratic obsessions, their need for paperwork mountains and their desire for amusement at the expense of the falang and i for one have had enough of it.
a yearly visit to immigration for my retirement visa is all i can take, what should be a relatively straightforward procedure is a 10 hour farce involving trips to banks, a marathon of photocopying followed by a rubber stamp fest at the desk of a gimlet eyed bint just looking for an excuse to send you off to do it all again.
its pathetic, its victorian and its humiliating.
we are not married according to the thai, and in the event of my demise, our joint thai bank accounts can be managed by my wife alone or could be emptied using her ATM card. the condo is in joint names and will become hers on the production of my death certificate, and the car is in her name and in the event of her predeceasing me, i can manage everything in a similar manner, except for the car which will be sold or transferred into my name by the sister in law.
registering your marriage here will just open a pandoras box, (or is it a can of worms?) involving expensive translations, standoffs with befuddled thai officials, confusion over surnames, trips to kremlin like government ministries and amphur offices staffed by bug chewing drones who have no idea of anything and worst of all by a long chalk...... the unhelpful and standoffish british embassy who consider all falangs married to thais as nothing more than perverted pimps.
you have come here for an easy life, so keep it simple. there is no good reason whatsoever to register your marriage here.