For anyone looking for travel insurance look up world-first.co.uk. (Hubby found them on I think the cancer research site) I was upset that I couldn't find anyone to even quote me for insurance until I was at least 6 weeks post treatment. I finished 2.5 weeks ago and previously a couple of companies said 3 weeks post chemo but are now 6 weeks.
This company has in the last month changed their policy and will now quote and cover people even during a course of chemo!! Hooray!