We are buying a house with only a few weeks to completion. However we have discovered that for the kitchen extension, which was erected 2 years ago, the sellers did not obtain permission from the leaseholder. The least states nostructural alterations within 7 years. They are willing to take out an indemnity policy to protect against any costs incurred however I am not satisfied with this as is doesn't stop the lease holder taking action against us. We have asked for the seller to ask for retrospective permission which they have refused. What would you do? Are there any other ways of getting round this?