backpackers travel insurance

Any general tips on travel insurance to travel without a specific date?
I'm going to China next month, but the intention my way back overland to the UK over a year or two. one long-term / backpacker would be good for me, but most insurance companies require a return flight to be booked. I only have a ticket no specific end date (only when I have money!) Ideas? Thanks guys! PS. I'm in the UK. Hello, I finally found a runner on me, and if anyone else is in my situation, they're called Globelink. Not cheap, but in tikcte somewhat like I'm back in the UK within 18 months. thanks!
I think we need a multi annual travel policy, and you need money to renovate after 1 year. Ensure that covers you for a long time, but it is possible that standard travel insurance does not cover your entire trip, as not coming home, then leave!
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