Kez and I visited the Homeshow a few months ago and came across a mob selling a composite decking material called Trex. We were rather impressed with it and liked the idea of a composite over pure timber as low maintenance was a priority. They had a nice selection of colours and the material itself is quite hardy and doesn't require oiling every 6 months (that was a big tick for us)!
We managed to get a design and quote done, and it was finally installed over the last few days.
I particularly like how the back retaining wall is now covered up by a bench seat.