Humbert, I don't think you have been paying attention! Back on 2nd October 2015 I posted the following:
"Ray, I will pay more attention in future.
"I will extend my permission to stay based on retirement" at the beginning of December 2015. My next 90-day report is due on 2nd December and the expiry of my current permission to stay based on retirement expires on 30th December. Last time I did my 90 day report the IO said I could extend my permission to stay the same time I next did my 90 day report. I note that the permission to stay will start from the expiry date of the previous permission to stay and not from the time I do my 90-day report.
In addition to the TM 47 (90 day report) and passport I will take with me:
1. SWMBO to sign the TM 30 and any other forms that are presented to her.
1a. Wife/girlfriend to take copies of her ID card and Tabien Baan.
2. Signed (on each page) bank statement for the previous 12 months.
3. Signed and embossed letter from the Briitish Embassy confirming my annual income is in excess of 800K per year.
4. Signed photocopies of the relevent pages from my passport.
5. Signed photocopy of arrival card.
6. Recent 6 x 4 cm photos of self (mug shot).
7. Signed copy of the Yellow Tabien Baan
8. Signed map of home address.
(Originals plus 1 complete set of photocopies and 2 mug shots.)
I think that will do the job nicely. Have I missed anything?"
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Humbert, the discussion about not getting an extension there and then at KCI has been previously discussed. Since the middle of this year the "permission to stay based on retirement" has been subject to home visits by the Crime Suppression Unit at KCI. They will notify you when they intend to visit your home address and expect to see you, your wife/girlfriend, the Pui Yai Baan and one other person who can confirm you are who you say you are and that you live at that address. After a successful home visit you will be given your extension to stay for a further year, albeit you have to return to KCI to get the stamp in your passport. Hope this helps.
N.B. 1a. Added to original list thanks to Humbert.