Replacing plug sockets

Try using a slightly longer screw. 40mm. They’re available from your local electrical wholesaler.

When you pull your wires to fit new socket there is always more wire or at a different angle to sit yours it flush on base

Make sure there's an earth wire (green & yellow plastic) in the wall as the metal outlet has to be earthed for safety sake. Depending on the age of the house sometimes there's no earth and even in "newer" houses built in the 1980s & 1990s. If no earth the usual most straightforward solution is to attach a length of earth wire from the earth terminal on socket to an extra screw which you screw into wall to the side of the back box.

Not trying to be condescending to you but adding this as lots of people read boards but never post or even create a profile.

Yes I know that but sometimes the original installer cut it off etc, stuff happens.