We are in the process of buying a property which we have found out has grade b mundic in the foundations. As it stands it is not mortgageable. To ensure the sale, the seller agreed to pay to have the foundations removed & replaced. However this has not been done. Instead the underfloor void has been filled with concrete to effectively shore up the foundations should the mundic start to decay the foundations. We don’t think this is an acceptable way of dealing with the issue & will probably have to walk away from the purchase but I wondered if anyone had experience of dealing with mundic foundations in this or any other way? Thanks.