Not quite to that extent but found same sort of thing in schools. To be fair clearly not an electrician that had done the work, but only found by chance, they had used different colour cable and I noted white flex into trunking and black flex out. If they had used same colour I may have missed it.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local