Buy greenhouse glass measured at 730mm x 1422mm (28 ¾” x 56”), the thickness is 3mm. This is a large size greenhouse panel so it won’t be toughened glass it will plastic such as polycarbonate and acrylic sheets. This size is also called dutch light. Both polycarbonate and acrylic are strong and durable materials that can withstand the British weather just like glass can so there is no compromise on quality and performance. You are guaranteed a product that can provide high performance and is a great substitute for glass. Plus the plastic sheets are a lot lighter than your standard glass panel. You can buy this panel easily online and it takes 3-5 working days to be delivered to your door. Me and My Glass is built on great customer service so if you need any help we are here.