The British Heart Foundation have a useful page with regards to travel insurance and you can find the link below.
We have tried to come up with a list of travel insurance companies for people to contact for quotes. Please be aware this is only from what we have heard so cannot guarantee best prices etc but it gives you an idea of some of the companies that people have used.
Explorer Travel Insurance - https://www.explorerinsurance.co.uk/Index.aspx
Post Office - http://www.postoffice.co.uk/travelinsurance
No Limits Travel Insurance - https://www.nolimitstravelinsurance.com/
All Clear Travel Insurance - https://www.allcleartravel.co.uk/heart-disease-travel-insurance/
Staysure - http://www.staysure.co.uk/travel-insurance
BUPA - http://travel.bupa.co.uk/home_3737_477482.html
Aviva - http://www.aviva.co.uk/travel/
Fish Insurance - https://www.fishinsurance.co.uk/travel-insurance-with-medical-conditions.php
Atlas Travel - https://www.atlasdirect.co.uk/insurance/a_quote_start.asp
Be Wiser - http://www.bewiser.co.uk/travel
Medisafe - https://www.medisafeinsurance.com/pre-existing-conditions-travel-insurance
Free Spirit - http://www.freespirittravelinsurance.com/
We do not endorse the above companies and cannot be held responsible. This is for information purposes only.