Many Insurers will now allow you to protect your No Claims Bonus even though the vehicle is being used for taxi uses.

What is the advantages of protected no claims?

The protection will usually allow two fault accidents to be committed within a 5 year period by the proposer or any driver named or entitled to drive on the policy without the no claims bonus being reduced. This is extremely beneficial to drivers that have built 6 years No Claims or more, as it is a way of ensuring that as long as they do not exceed the limit of (usually) 2 claims with a period of five years their bonus will remain at maximum.

Each company does have a different scale as to how many claims they will allow and over what timescale.