Hi I hope to install a new ring circuit for a kitchen extension. The cables will run behind dabbed plasterboard walls. After doing some reading on here it appears that I have to protect the cables or bury them below 50mm. What is recommended for protecting them, pvc channel/conduit or metal ? Also my cooker is gas and only needs a 13 amp plug connection. Will I still have to fit a cooker socket in case of future use ? Thanks