The Money and Pension Service (MaPS) have designed the Medical Travel Insurance Directory to help those with medical conditions which might be affecting your quote.
This includes conditions which might be excluded from cover, or if a high additional premium has been added in connection with these conditions. The directory gives you access to several specialist providers.
Website: Travel Insurance Directory | MoneyHelper
Tel: 0800 138 7777
This short video has been created by the Money Advice Service to give you more information regarding their Medical Travel Insurance Directory: