Popped down to my local electrical supplier to see if he had anything. A few mins later, after a rummage through the back, he comes back with one DP switched FCU in shiny chrome and with the required matching curved edge and white insert - perfect! Left over from a previous order apparently, so it's mine for a fiver.
Swapped switch over and replaced the 13a fuse with the 3a one from the old switch.
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