Extractor Fan Switch. Cooker Hood Switch. Fits standard UK 1 gang backbox with minimum depth of 35mm and 60.3mm. Boiling Tap Switch. Fuse Carrier 13 Amp. Blank Insert (No Switch). White plate with white switches.
www.ebay.co.uk
Available with the switch text you need
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That looks like MEM SPECTRA to me probably 20-25 years old, its been discontinued, it looks like these people have new old stock 3 gang cover plates for it: https://www.radwell.co.uk/Buy/EATON CORPORATION/MEM/M803 at a slight premium, but TBH changing the whole grid arrangement is not going to be cheaper and if you are not confident doing that then its probably a valid option
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