The problem is too few people understand that the solicitor YOU hire is there to do what YOU say ( within the boundaries of the law ). One solicitor told me I needed Chancery Liability Insurance when I was purchasing a house. I pointed out what she meant was she recommended I had it, not that I...
What the buyers solicitors want and what is required are two entirely different things. Depending on how important the sale is to you I personally would tell them that if their clients want that insurance then they will need to pay for it.