just my 2 cents,
I have flown Dublin - Wales a few times (Caernaforn ??) and I also Surf a lot up in the cold Atlantic off the coast of Donegal (water temp around 11 degrees).
With a 5mm wetsuit with gloves,hood and boots I am okay in the water for around 1.5 hours.
If flying over water again I ideally would like a drysuit and life vest and a streamer at the very least, any extra items a bonus.
Drysuit and Altitude are your friend in this crossing.
Take care,
Fionn