I just replaced my screen today. it was a rather chipped heated screen. As I've used it perhaps twice in two years fr a few mins I figured plain glass will be fine. Glass was cut by Stevenage Glass. It's 4.5 mm toughened. They put a mark on it, not CE but says toughened I think and Stevenage Glass. It's small, right by where the mirror goes so hidden. They did it for £30, a couple of local members also got spare screens 'just in case'. Totally agree on getting a can of silicone spray. Use it ! Remove knee panels undo nuts, cut wire, take to table. Remember how you removed screen. Especially orientation of the triangle wedges at the base. i was lucky enough to get a new surround from a member recently who'd had his screen and frame replaced under insurance, it was the more modern matt Ali surround which I had metal polished to shiny shiny shiny finish. I found using a load of silicone spray meant the rubber went into the surround easily, after first wrapping around Glass. I have fitted a new mirror, old one was slightly pitted. I used the glue in the tube fixing method. You put glue on the mirror base, put a bit of supplied gauze on that, then press on screen for a bit longer than a mi ute and leave overnight. All done in an hour and a bit. Taking bets on when my next chip will happen.