They shouldn't be letting this issue go on as it will build up to an even bigger issue. As regards the management company and getting others to agree, a thankless task I'd imaging. Just pay for an expert to sort out the problem.The reason i not replied earlier is the owner lives abroad and back for Christmas so this came up again.
Does this mean that if any other owner wants to examine under this property they need the permission from the owner of the property i mention.