Had the above in for service today , came to remove plugs , NO chance !! These run Bosch BNAR13-318 plugs which instead of having a hex have what I would describe as about a 12mm male multispline fitting for a socket. Spoke to Citroen and there is indeed a special socket for these which you can't buy on its own, it comes in a kit of other tools so my question is where can I get the correct socket and has anyone else come across this problem ??