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But 17mm fits? Try a deep 17mm 6-sided socket or box spanner. 12-sided sockets are quite likely to slip on brass, as they can just round the corners off.
 
Can you get a socket similar to the Metrinch brand type, or even a Metrinch socket? Some other decent sockets have a similar system in place. I believe they are also known as knucklesavers.
 
Hi, instead of trying to find the ceramic discs, would you be interested in maybe changing the tap itself? If so and you can take the bath panel off and have a look at the setup,take some pictures. I'm sure me and the rest of the lads could try and keep you right. At the end of the day, if you know where to turn the water off you can have a shot at it. £40 for a set of taps and an afternoon fitting them would spare you the hassle of sourcing parts, just a suggestion 🙂
 

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