Just to be clear: is this junction box between the external wire coming in and your master socket? Or is it between the master socket and some internal extension wiring you have?
If it's internal - you are quite within your rights to go ahead and fix it anyway.
If it's external - I would be inclined just to fix it yourself. Or if not, then when your children pull it off the wall then there will be a fault you can report
You can get your SP to order a master socket move - but that will set you back £160 (I think).
If you have not yet ordered FTTC, and you have an old style master box, you *might* be able to get an engineer install to update the master box. I don't know if that still happens, or all FTTC is self-install these days.