Hi Ploppy. 

Hope that your first radiotherapy session went smoothly. 

We've lots of posts about travel insurance and which companies members would reccomend on the forum. If you use the search function (magnifying glass) in the blue bar at the top of hte page and enter the phrase "Travel insurance" you'll get lots of posts suggested that you can read through. 

I hope that the rest of your treatment goes smoothly and you enjoy your holiday! 

Best wishes, 
Jenn
Cancer Chat moderator

Ignoring the cancer side of things, I normally take out travel insurance when I book the holiday as you’re then covered for cancellations caused by your own or other’s sickness. The actual travel dates are recorded when you buy the insurance and cover starts immediately. The only times I’ve ever used it were due to cancellations caused by my wife’s broken leg and other medical emergencies.