I went on one of the insurance comparison sites (probably Moneysupermarket.com or insurancesupermarket.com - wouldn't have been confused.com because their adverts are bl**dy irritating...).
You answer a few questions re whether you want single-trip/annual cover, Europe/worldwide, single/couple/family, dates-of-birth, etc and let it find policies and prices.
Pick a price or company you fancy, then read the small print of what the policy offers you
Ensure it offers cover for a cycling holiday - some will class cycling as a 'hazardous activity' along with white-water rafting, scuba diving, bobsleigh, etc and might either not cover it at all, or only cover it as an activity you do for a day or so on holiday rather than being the whole point of the holiday.
But you can get proper cover very cheaply these days - I got an annual policy for me and Mrs wrx which will cover us for a trip to Madagascar and for me to have a week cycling in the Alps for just under £40 I think.