You do know how "Dependent" visas work in the case of B etc? Are you arguing a DTV "Dependent" visa is somehow magically different? On what basis did you come to that conclusion? PS: he is getting a "B". I doubt he is paying anything himself through an agent if working for a company.
Never ever heard of it. In my last company, foreigners were sent to Singapore for the B. Must be hundreds over the years and never an issue - it was a large company.
Legally she would be a "Dependent" on a non-existent visa. If this was for a " B" in same situation it would be cancelled along with yours. Is the DTV linked in a similar fashion in the system? Even if not if anything was found later it might be a sticky situation. What would your employer make of it too if you had to go asking for a dependent on the B at a later date and immigration made it problematic due to misuse of a previous visa? Why take risks? I would just get her the dependent on your new visa.
I think the demand for DTVs has fallen off but that is to be expected. All those who wanted them initially probably got them in first 6 months. Now just a steady stream.
I doubt the MFA pay much interest to the DTV these days and have moved on to other priorities under a new minister. Not seen any of their staff interviewed about it or promoting it for over a year.
90 Day Report in Chiang Mai i do to the airport branch. There is a drive-through window with a walk-through window right next to it. Dont it twice there now and never more than a few minutes. I completed the TM47 form available there, handed over the passport and TM30. I do not think TM30 is required as they scan passport, print out 90 day report receipt and that is it. Simple, easy and quick
Let them know that. It's a long time since I did it but is there not a form you sign for the HMRC where you declare you are non-resident in the UK for tax purposes. Show them that if possible.