OK I was being facetious when I suggested using Waitress or M&S, sorry. IF you are going to find it really difficult when it comes to actually saying No, perhaps, and only if it makes it easier for YOU, not THEM, you could soften it by offering a sum of money to be decided by YOU towards the cost but then that will be the end of your involvement? Just a suggestion to perhaps make it easier for you, NOT that I think you SHOULD.