The shower pull cord isolation switch has been wired incorrectly, which is concerning because a professional person would know that it is important that any switch with a neon light on it
SSL635 45 Amp DP Shower Pull Switch with Neon – 1 Way – Part M – Selectric UK
Shower Pull Cord Switch Double Pole Bathroom Extractor Fan Ceiling Neon 45A DP | eBay
MK Logic Plus 50A DP 1 Way Ceiling Switch with Neon White (3164WHI) | CEF
45 Amp DP Ceiling Pull Cord Electric Shower Switch With Neon (45 Amp DP Ceiling Pull Cord Electric Shower Switch With Neon)