On the 2012 plus 4 the relays are behind the dashboard, so only accessible if dash is removed.
The fuses however are on the underside above the gearbox tunnel, and they can easily work loose due to gravity.
Are there 2 sets of fuses? My fuse panel of 6 or so fuses are on the top drivers side of the engine fire wall above the ECU box. The RAC guy took each of those fuses out and checked them.
Yes, the set under the bonnet as you mentioned but also, as Dave said, the two banks of sub fuses above the gearbox tunnel, those being the most vulnerable.
