Some more....
Here's an attempt at wiring a junction for two dimmers to feed spots and uplighters in the living room. Nothing wrong with the connectors he used, but they should be in a proper enclosure. This lot was just stuffed loosely under the floorboards with a couple of turns of tape around it:
This work must have been done by the guy the owner threw out a few months ago. Here's his idea of how to wire the downlighters in the kitchen:
Turning to a mess created at some unknown time in the past, here is a "twin socket" hanging loose that was still being used!
Apart from the problems obviously visible, the cable feeding this outlet is also undersized.