Nice idea, I did consider one of these, but they're a bit flimsy unless you spend a lot on them.
This (http://www.screwfix.com/p/lap-2-gang-45a-dp-cooker-switch-13a-switched-plug-socket-brushed-chrome/30288) is perfect as it gives me accessible switched isolation for the hub/oven, as well as providing a single socket for occasional use - both in a convenient and easily accessible location.
Thank you to everyone that responded in this thread, I finally got around to wiring it this weekend, the oven and hob are fitted and working beautifully and I even have a handy plug socket at the end of the island which I hadn't considered having before.
Still lots to do in this kitchen, but its coming on quickly now and this forum is an awesome resource to help DIYers like me.
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