Travel insurance with pre cancerous cells

I’ve been treated for pre cancerous cells in one breast. Had the surgery’s and now just waiting on radiotherapy dates.

I have travel insurance paying monthly with my bank.

I told them about my diagnosis, they quoted for an extra £30 for the year. As well as the continuing monthly fee.
Just wondering if this was about right/good deal?

Or if anyone else with the same diagnosis used someone else for travel insurance? 
Thanks x