Income protection cover pays you an income if your current income stops. This would give you the peace of mind of knowing you could still cover mortgage payments and household expenses, even without your usual salary or wage.
Critical illness cover can also offer you peace of mind. It does so by paying you a tax-free lump sum if you are diagnosed with one or more illnesses specified by your policy. Critical illness policies are very precise about what they cover. So you should make sure you understand exactly what is covered and whether a policy would meet your needs.
To check this, you should meet with an Ask Acorn financial advisor who will explain exactly what income protection cover and critical illness cover can offer you.