Will my premium definitely increase if I'm asked to supply more information or go for a medical?

No, not necessarily. It does not automatically follow that your premium will increase, especially if they find that you are in good health. 88% of people who apply for life insurance qualify for the price first quoted in our experience.

The reason why your premium could potentially increase is because of the assumptions made by the insurance company on initial quotation. They assume that you’re in good health for your age, that your occupation and lifestyle do not represent a risk to your health, that there is no history of hereditary ill health in your family, and that you don’t regularly visit countries with known health problems.

If any of these assumptions are wrong, then they will want more information from you so they can see if you are in fact a higher risk customer than they originally assumed. If you are applying for a large amount of insurance, they may also ask you for extra information.