Not really - we rejigged the quarterly periods to remove the need for a lot of summer night flying many years ago and a 90 day night currency was hardly demanding to maintain.
Just because the 'centre' doesn't get night for the summer doesn't mean the rest of the UK is the same.
Perhaps a little foresight and understanding of SAR training might have led to a southern base -Newquay for example- being used for NVD training instead of Stornoway or Inverness.