I am a competent DIYer and experienced house renovator with experience doing electrical work and the equipment and self-taught competence to test the work I do. I have stuck a building control application form in, but haven't paid the fee yet and am having second thoughts as to whether it is technically notifiable. I do everything by the book, so want to do it properly, and if I have to pay the £350 I will, but it would be nice to save some money. Approved document Part P (England) is vague and I can't find detailed guidance on any of the scheme websites. 40A unused RCD protected MCB & 6mm2 T&E, all in good nick, fitted in 2018 but power shower it was supplying was disconnected. Plan is to terminate into a Wiska box, gland to 6mm2 SWA, run 6 metres into shed, terminate into a 45A cooker style switch, 3A fused spur for lights, 13A fused spur for underfloor heating mats to save wall space (mats draw a total of 7A), and a run of 9 sockets. Dwelling side is a TNS so exporting earth should be fine pending test results, no extraneous conductive parts in shed.