I never, ever change mine. I use a butcher block and a huge thick wooden cutting board, only taking care to keep my fruits from suddenly tasting like onions or garlic. Studies have shown that a wooden cutting board is naturally resistant to bacteria, so I scrape and then wash mine off with soap and water after use. All this absurd paranoia about cleanliness is the product of marketing, not science, and the supposedly more sterile plastic ones are actually much better petri dishes for bacterial growth, which is why they must be cleaned and disposed of regularly. Fine if you want to keep plastic cutting board manufacturers in China working, but not at all safer or cleaner.

Hi there, sorry to hear about the problems you've had. Ashton's have given good advice, and the flex-seals are a good option to reduce your risks of leaks further. I too would be interested to know what tray you used? The quality of trays can vary hugely, and over the years we've narrowed down what we use to a few suppliers we trust. It is not until you come to fit or, indeed, still later that you find that "bargain" was actually an expensive mistake. I'd echo mayfly's advice too - by splitting all the elements of your bathroom (different products from different suppliers, different builders/tilers etc), you leave yourself open to escalating problems with everyone blaming everyone else. If you go to a single independent, they'll put together a package based on products and tradesmen they trust, and if anything goes wrong you only have to deal with one company, and they'll normally move heaven and earth to fix it. And their tradesmen & suppliers will move heaven and earth to sort it too - they won't want to risk losing all that repeat trade where they might walk away from a single difficult job. It might look as though the up front price is a little higher than doing it all yourself, but when things go awry you may find it is a false economy. I hope you get the problem sorted and good luck with the kitchen too!

You can use a range of depths outside including Porcelthin at a depth of 4.8mm. The tile depth has no differentiation on weeds taking hold. http://www.porcel-thin.com/

When I redid our bathroom I had large tiles with a mosaic panel going vertically. The fitter told me to ensure both tiles are the same depth. Maybe a good tiler could work with the different depths? I’d give him a call.