Peaceable Projects Inc. is a U.S.-based non-profit group that brings the vast resources of the wide world together with the ongoing needs of the people who live, work, and travel on the Camino de Santiago pilgrim trail network in Spain.
Never thought about this before as I have 12 month insurance for travelling outside UK but will check the small print. I assumed I was covered for the Camino.
Regarding your question try looking at Ramblers Association website. They probably have insurance deals or at least recommended companies.
I would suggest that you take a look at the coverage that is included with membership in the UK branch of the Austrian Alpine Club. Here is their summary:
"The policy provides OeAV members with worldwide cover, without age limit for mountain (and other leisure activity) Rescue, associated necessary but limited Medical treatment, and unlimited costs of Repatriation."
I have twice had cover while walking the camino with a U.K. company -
"Globelink" Telephone No.0870 112 8208.
From memory 6 weeks cover was circa £60/70.
Unfortunately I had to use the cover and found the service superb.