Wear ND Jet Fins, they love play and bite them
In Dublin bay, seal are very shy; don't like fast movements and noise fast boats
In Dun Laoghaire swimmers, seals and scuba divers share the sea
They normally avoid scuba divers but they come if you're swimming or doing skinny diving
I've learnt about seals behaviour more from swimmers than scuba divers so it might be good idea ask to regular swimmers in the area
If an area shared with swimmers, definitely, feeding seals isn't a great idea and if there's children around is .... incredible irresponsable!
Anyway, from my experience they might go to you if you're doing snorkel or free diving.
If you meet one during a dive ... slow down, pretend that you're ignoring it ... small seals like the Jet fins (I think because they looks like mum or dad fins) so, in your case, it might be a good idea that your buddy wears it and you don't ... even though the seal is behind the fins of your buddy it keeps an eye on you ... like small children when they know there're doing something wrong!! so keep the game of pretending that you're ignoring it
I know it's sound complicate. It isn't and is a good fun
Maria