The standard shore power system for a 235 is a trailing lead as Paul has described, so there are no standard positions for mains sockets. I used a standard camping system for a couple of years, which is ok, but a bit of a nuisance.
Last spring, I fitted a full mains system complete with battery charging and 12v supply. A fit and forget system. We cruise the Solent and adjoining areas each summer for two or three weeks by marina hopping. We simply plug into the pontoon supply and every thing sorts its self out. Next morning we have fully charged batteries and off we go. If you want more information, please let me know.
I put my main socket in the end of the starboard salon locker, adjacent to the 12v isolator. My reason for this position is that it keeps all vulnerable electrical fittings in one locker leaving the forward locker free for tins of food and drink, which are best stowed low down.
Graham Ebb
235/25 Blue Jazz