Thanks for the patronising reply when I was just trying to be helpful. Maybe I should have called myself something else rather than Vicdiy to avoid such an unfair comment. I may not be a professional but I have done loads of jobs at my own house and relatives ( for no charge) and they have all been done to a high standard. Tell me what is wrong with checking and replacing sealant every six months when it can leak and cause all sorts of damage. One of my daughter's recently moved into a new house and had a wet patch in the hallway, although the sealant around the shower looked fine this turned out to be the problem,it took me about an hour to rake it out and reseal what is unreal about that!