Yes, saddo geek here, to put all of you out of your misery, just as Green Flash predicted!
Gainesy,
The blue-green light you saw on the Sea King was one of the nav lights, which are always turned on (except when in really thick fog at night!). For some reason, the starboard nav lights on RAF Sea Kings have always had a blueish tinge rather than being plain green. The aircraft would also have had the twin white nose lights you refer to - in fact it would have four on the nose (two fixed, two moveable), like all Sea King 3/3As do - but these are hover/flood lights, not nav lights. You wouldn't have seen these because they're not often turned on by day.