Do you have to use Berker socket outlets??
A friend has had his non Bavaria boat re-wired by a qualified and experienced electrical engineer, and using domestic power sockets. Now I'm guessing that many readers will sniff at such suggestion, but his installation has been in place for at least five years, and up to now he has had no problems with it. On the other hand, I replaced one of my European round pin sockets with a Berker three pin UK style socket, and was less than impressed with it. It does the job, but the spring loaded flap over the euro socket it replaced, will not fit the new socket despite them both having the same footprint. Also I saw nothing in the Berker socket apart from its shape and colour that would set it above a decent UK domestic socket either by way of quality of manufacture, or use of materials.