Just started looking into the insurance side of things and this is definitely a question that is raised against the length of the lease. Think renewing it on another 12 month basis in the last month of the lease is the best option.
I'm a newbie in the PI game and came on here for a bit of advice on this subject.
I'm actually going to spend a few hours online later having a search around on the internet.
Will let you know of any findings but look forward to seeing what other people say...