I have had an Ariel for years since we all got freeview and my Ariel beens ok but recently my tv keeps going because the Ariel is so loose you could blow it out the wall socket. But they all seem universal so I can’t find an Ariel that fits tightly. Please help
As I read your question though (although I admit that I might be wrong), it seems to have nothing to do with your aerial, per se, and relates solely to the fly lead that runs from the wall socket to your TV. If you've tried several fly leads, but they're all too loose in the socket, it would seem that it's the socket itself that requires replacing.
Wiring it in isn't difficult. Basically, you just need to look at how the old one was connected up and do the same with the new one. If you need instructions though, see here. (If you click on the title of the video, instead of on the 'Play' button, it will open in a new YouTube window, making it easier to view):