Wathana quite certainly from reviews on here and LLP got it in the associated flat.
River Kwai is just a rub and tug place, the girls like tips from HJs but they don't 'perform'.
Oi! Got what?! A handful of visits to try some of the roster and all offered up to FS iirc for standard(ish).
Is this mamasan "Niki" and her crew in the flat overlooking the bus stop and the lowrise flats with curtain twitchers?
At the time they would run several GT ads leading back to the place, one run "independently" by a veteran Thai who was friendly and game on but perf and weathering didn't justify the effort to repeat.
3-4 rooms to ply trade and a single serviceable (just) bathroom shared.
Haven't been there since last review (years ago?), only one lady was pretty enough to tempt a return but her actual service only ok. A group of practiced SPs that would have their regs but none wowed me enough for repeats upon further consideration. None appeared under 35 and most more worn. Plenty of the like within easier reach of my travel lines and without the gauntlet of spotters.
Niki also tended to switch around names or double/B&S bookings so "new" girls rarely were, think I wasted a couple of visits that way so stopped going.
The basement place she ran (I think it was her) near Tower Hill for a bit was better for age and looks of the actual new/unknown girls but some were asking too much and most didn't hang around long. Lovely latina there I repeated a clutch of times before she went home for good. The location is still open but no more "Thai" massage and the replacement didn't suggest extras are on offer.