Thank you everyone, your thoughtful advice was very welcome. I'm attaching a photo as its all finished. I selected Olive Reserve for the splash back and painted the wall above it the same colour. As its a big room with lots of light and a large window it doesn't dominate. The glass is so easy to keep clean and I love the way it reflects the garden and light. Have to say though some people are stunned into silence when they see it, but as the cupboards and bench tops are quite bland I knew something bright was needed

Mirror splash backs would look lovely in a show home. Mirrors are only stunning when there sparkling clean. They would annoy me if they were constantly needing to be cleaned. I think you would be creating an on going chore for yourself, like Karen Mc, they would drive me crazy. Why don't you have a look at some of these https://au.pinterest.com/GDBully/kitchen-window-splashback/ There are endless choices, I wouldn't be making work for myself. Depends I suppose how long you are going to live there.

The Less Glass in your shower area the better - if you can avoid it. Eventually shower screens, no matter how effectively and often you clean them will deteriorate over time and shower signs of glass cancer. If the space allows it, effective planning can allow shower walls and other alternatives work effectively without the worry and hassle of cleaning glass. Thanks Paul

We built a pool exactly the same, however we didnt use laminated glass but a monolithic piece of 80mm thick Plexiglass 3mx2m from Germany. This reduced the overall cost of the pool considerably. Pool was fantastic and doubled as a water feature when not in use. Incorporating LED lighting allowed the pool to take on the mood of the night. The only downside we found with the pool was that after heaving swimming and sunscreen the waterline of the Plexiglass would need a clean. Other than that it gained lots of comments and was even used for photo shoots and promo work.