The Aviva health insurance company is to increase its premiums by an average of 4% on a range of plans, with effect from 31 March.

There will be an increase of up to 6.4% on some plans.

However, the company also said there will be no increase on many of its plans, in particular on many of its entry level plans.

Aviva said the increases were caused by the effects of recent changes to the health levy and the rising cost of claims.