If someone installed a small cu into a brick built shed. Fed 8 plug sockets (from a 16A MCB) and two 60W flourescent light fittings (from a 6A MCB), then ran 4mm 3 core SWA from this cu back to the house (15m length, burried 2ft deep), and then, once inside the house, connected it to a 3 pin 13A plug to plug the whole thing into the mains. Would that circumnavigate the need for Part P qualification? It would, after all, just be a gloryfied extention lead, no?