Moving to London: health insurance?

Hi all, after deliberating for ten years I'm finally making the move to London in the spring. I'm single, almost 40, and ready for the challenge. I'm leaving behind a job and parents/siblings/neices/nephews that I love, but the time has come to give it a go! I have a British passport, thanks to my Scottish dad, and a free place to stay in central London. Not worried at all about finding work. My question is for anyone who moved from Ontario: how did you deal with OHIP? Since I'm not sure if my obsession with London will turn into years of happy living or three months of misery before I skulk home, I don't know if I should hang on to the OHIP for the moment or what. Any advice appreciated.
Thanks,
A