Prior to looking into this, check with your company to see if they provide the same in their employee benefits package. Instead of critical illness, it is possible that they cover disability income protection which serves the same purpose – providing financial support in the event of a major illness or accident.
Even if your company does provide something, it is important to check that the sum insured is enough with regard to your current family situation. Indeed, what will happen if the breadwinner of the family cannot perform the same work anymore? It is important to keep in mind that the coverage is for the long term and you probably won’t remain in the same company or the same country in 10 or 20 years. By relying only on the company plan, you will most likely not be able to achieve this result.