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Looking at wiring a loft conversion , it’s a large loft and there will be a bathroom a bedroom and a walk in wardrobe , The sockets are wired from the loft but are in conduit to a junction box (have only located one junction box just now) I plan on taking my cables for sockets and lights to the main DB to be on there own circuits instead of tapping into any new ones , there will be 8 sockets and a some downlights , there are no spare circuit breakers in the main DB I am wondering can I use an existing mcb for say the upstairs sockets for my socket circit and make mine a radial circuit to have more space in the MCB and the Lights into the upstairs lights MCB as there will only be two switches to go to in the loft doing loop in at switches method . Any other ideas would be helpful but if I need to will just have to change Main DB to gain space for new circuits