I'm hoping to install an outdoor socket (a weatherproof one from Aldi). I have a light switch for the outside light inside the back door which is in line with the position I require the socket. Would I be able to work a socket from the light switch wiring? I want the socket at normal height outside.
I also want to wire a shed for power. I have the required cable in place laid from the shed foundation to my back wall, outside where I have an internal socket powering the dishwasher beside the kitchen sink. I hope to place a second socket here and provide the required power to the shed.
No you cannot take 13A socket feed from lighting circuits.
To comply with regulations regarding outside sockets, you have to be quite rigorous as regards safety. Unless you are comfortable with electrical circuits and preferably have some experience I would advise getting a qualified electrician to do the job.
look up a registered sparks to price this as you have all the required parts it will be a case of labour for this job which should vary from 25 euro per hour to 50 but with what you describe there is less than a couple hours work for a qualified sparks