For those who collect Thai Airways Royal Orchid Plus miles via IHG as opposed to Rewards Club points.
IHG :
www.ihg.com/content/gb/en/deals/member-offers/thai-airways-double-miles
Thai Airways :
news.royal-orchid-plus.com/home/info/marapr2018/basic/en/184
Earn double miles for stays between 1 March and 31 May 2018 at choice destinations across Thailand, Vietnam, Cambodia, Indonesia and Singapore.
(Note that lower down the page and in the T&C's the countries are: Thailand, Singapore, Korea, Indonesia, Vietnam and Malaysia)
Note:
* A stay constitutes a “Qualifying Stay” when member stays on the Double Bonus Package (Rate Code IKDBP)
* Only one room per member per Double Bonus Package Stay will be awarded the applicable bonus miles.