Spacer lad
Car Insurance companies are consistent in their treatment of everybody. They don't care whether you are blue, brown, civvy, mil or Martian. They'll look at your postcode, car, your age, sex and occupation and take an arbitrary view. Granted, I've been out for 10 months now, but in my time in, I did not find an insurer that was sympathetic to the military. In some respects, quite the opposite.
Example:
"Is your car garaged overnight Sir?"
"No, but it is parked on the drive and there is an armed guard within 24hr line of sight 50 yards away."
"So it's not garaged then?"
Get my drift. Ring around and get the best quote you can. Although, having seen how you threw that green Caravelle around, buy, are we in trouble!!
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Good luck!