Car Insurance and Gap Year

So I need to renew my car insurance soon and I'm most likely going to be taking a gap year next year. My current insurance company (with a black box) has given me a quote of something like £800 if I pay all at once. But this has my occupation as a student and after going on price comparison sites my quote goes up to £2000 if I'm unemployed or at an entry-level job. What should I do? If you change occupation midway through a policy do you have to pay the difference or just the amendment charges? Technically I'm still a student until August and I still don't know if I am going to uni (grades and all that). Should I phone up and tell them about my situation? My fear with that is that they will just up the price. I'm a safe driver and they know this. Thanks for any help.