AEI indicate their BS8436 offering will perform satisfactory, BUT it is necessary to be SURE there is NEGLIGIBLE RISK of mechanical impact. That is actually very hard to do - it implies electrical cable concrete capping.
So SWA remains the gold standard - I prefer E1W glands where fitting quality could allow water to penetrate, thereby protecting the armour from filling up with water or condensate (SWA tail twist crunch test).
I am surprised that there has never been a 1.0mm SWA with lighter armour and micro glands specifically for outside lighting. Too often H05/07RNF gets used, although BS8436 makes an interestingly safer alternative.
So OP has gone with SWA, worth the battle and wrestle on the living floor if necessary :-)