Economy 7 socket to socket circuit?

[SJRSJR]

Well I did wonder...

So an electrican has, as expected, pointed out it needs a new CU, but given that the object of the exercise was make use of a socket, £600 is not worth the bother. Is adding an MCB and RCD to the Shower Unit still possible?

 

[ban-all-sheds]

1. An RCBO could be added to supply the old heater circuit.
2. The switch could be replaced by an RCD and an MCB added - that would add RCD protection for the shower
3. The switch could just be removed and 2 RCBOs installed.

Don't see why an electrician should charge anywhere near £600 to do any of those.