The socket that your Electrician said "can't be heightened" the cables come up from the floor, correct so far? if yes is the floor a solid floor, or of wooden construction? if wooden can the boards be taken up? if yes then any decent Electrician could extend the cables under the floor using a MF JB (Maintenance Free Joint Box) doesn't sound like a difficult job. The other two faults may look serious to you but a simple fix can be found, is this Electrician a member of any of the CP Schemes, NICEIC as an example? sounds like a bit of a chancer to me.