For your interest, we've just found a travel insurance company called World First 0845 9080161.
My husband declared various medical conditions, Vasculitis, Triple Heart Bypass, Skin Cancer, High Blood Pressure & Cholesterol. The premium for 3 weeks in Europe is £47 + £25 to cover the medical declarations. That's a total of £72 which also included me with no declarations. The premium was £104 for annual cover.
What they are like if you have a problem, we hope we don't find out but it's a VERY competitive price.
Beware, we had some quotes, which although we declared his conditions, offered us the insurance but without cover for the conditions declared. What would be the point of that?