Do0n't r4eally see much from the OP. two posts.

Seems to me he has went through the worst of it the emotional pain. Desertion is specific reason fro a divorce here

Nothing here to lose. She is entitled to half the assets just as you are. That being said a judgment here is not enforceable in other countries. So don't bring any money here. You owe her or the family nothing.

If you filed with the British Embassy, I would ignore that, until I had my legal work done here. File it when it's finished with the embassy there after.

It's very simple legal matter here. If both parties agree you don't even have to go to court. Just sign documents at the Amphur

She seems to be on the money train so I doubt she will go for that. But. it's still simple with no property or other assets involved. Many of these girls believe rumors and think they are in lot stronger positions then they really are.

If you want the name and phone number of a local attorney who is honest I will give it to you.

If you have not registered the marriage with your embassy,don't plan on coming to stay in Thailand,no assets here,I would forget about her and any support.
If your are planning a divorce,I would contact a lawyer .It might help to keep the pending divorce quiet if the lawyer thinks a Private investigator might help.

This is going to sound very mean of me, but the craziness had to end.
One of the first things a farang friend of my girl told me "she's not very bright". I should have heeded his advice but rushed into marriage, spent a fair bit etc.
Years later, I rather used the stupidity against her, as I really wanted to 'clear the decks'. She had no money/idea of solicitors, going to court etc. and I certainly didn't want all that hassle. I had no assets here, except a car in my name. The Thai-style house I built was really the family house and I had no qualms in losing that. I simply used the temptation of a small sum of money to met me at the Amphoe to divorce. As Bumper says, it's very straightforward, just need your paperwork and witnesses on each side. She grabbed the money, I kept the car, she probably went off to play Hi Lo, or invest in a daft idea, but I was free.
Sounds awful, as she did have children(not mine) but enough was enough.
In your case, if you wish to get the paperwork sorted etc., may be worth trying the 'temptation'. An easy route out.
Day after divorce, 'ex' phoned to ask for more money. I said she was daft!. Whoopps, too late. It was at that point I changed my 'phone number.

actually it is nice to see people win sometimes. Did pretty much the same thing with a Flippina divorce. We had Children and I paid through the nose on Child support. I really had no problem with that. She was greedy could only see money. I gave her S 20,000 cash. Paid a f off all the family bills about $30,000 Peope4l actually thought I was crazy.

But she could have had 1/2 of my Police Retirement for life. So that was a small price to compared to lifetime income.

She actually believed she could control my after the divorce, she was wrong. Sometimes in the end money grabbers really get what they deserve.

Thanks for all your advice.
Since my last post the following has happened:
I have had limited communication with my wife, only through SMS chat systems, i.e. in writing, no voice.
She continues to live her her home town (near Udon Thani), and states she is seeking a job.
In June, she reverted to her name on Facebook, meaning her public face.
I infer from this that she has changed her name on her ID card...?
In July, I spent 3 weeks in Thailand (but not in Udon), and had the same limited contact with her.
During our chats, she admitted in writing that she has a new lover.
Meanwhile I have sent her no money since April (she left me in March).
I asked her how she (and her mother and aunt that i was supporting) are surviving; she refused to answer.
I said "You are getting money from your new boyfriend, right?" Again she would not answer the question.
Just to recap: I have no assets in Thailand, and the marriage was not registered with the British Embassy (I only obtained a "Certificate of Freedom to Marry" from them before the marriage). I also gained no assets (apart from my salary, of which I spent a significant part on her) during our marriage.
One other important fact: her new boyfriend is a "falang" with a condo in Pattay, I believe. This means, among other things, that in adversarial terms, she is advised by an interested party who is considerably more worldly than she is.

You don't need a divorce, she doesn't need a divorce so why are you prolonging the break up?
Get over the fact you have been conned/lied to/fooled/cheated or whatever.
Change your phone number and walk away.

Sound advice my friend.

Wait a short period then with a Thai friend ( translator 0 attend the amphur and file for divorce on seperation either 3/7 years not sure which one.
Cheap almost free make sure you take your original certificate.
legally she cannot remarrty in Thailand until she is divorced from you but we all know that is not quite true.