Thanks everyone for your ongoing views - it's extremely helpful to me as a consumer (who thinks it looks unacceptable!) to get the opinions of people who know so much more.
I'd love to 'name and shame', and will have no reservation in doing so if it proves appropriate, but I only wrote to bring this to their attention today when I found it, so I'll give them a couple of days next week to get their act together and see what their response is like.
I can say though, that they are a REAL and MCS registered getup (I've checked), and I received a NAPIT Electrical Certificate for this work by their electrician?!
"As already mentioned by Tel, looking at that standard of workmanship I'd be checking the entire installation and preparing a full snag list."
I've looked at everything else and it looks fine, but then I wouldn't know the finer details of what could be wrong.