I tried something similar tio this a few years ago regarding my car tax and insurance. At the time, I was spending 3 wks deployed and 2 wks back home (not too strenuous I know, but after a couple of years??)
I asked the department of transport if there was any way of getting a refund on my road tax, in view of the fact that I was spending more than 50% of my life out of the country.
Answer...NO
Reason...That's what you are paid for Sir, and don't you get something called an X factor in the forces??
Asked the same question to the Insurance Co and was told that as I was not driving in the UK 'regularly' they would look into it, but not for a refund, for an extra loading!!!
They claimed that 'people without regular driving experience in the UK are more likely to have an accident' So I dropped that one pretty quickly!
The old X factor is the 'Official' answer to all of those little points chaps, and the bottom line is....We don't have a Hope!!
Never mind, keep smiling
Regards
The Swinging Monkey
'Caruthers, is it time for a scotch yet?'