Hi Diz Daz
As an proper qualified electrician I would be asking a few questions first.
1 - Is the cable to the shower properly rated - I'm thinking you have just had a plumber in to replace your old one so have you gone for a bigger wattage shower and is the cable ok.
2 - Is the circuit breaker of the correct rating and is it of the correct type.
3 - Is the rest of your installation up to scratch ie is your incoming water and gas supplies correctly earthed and are all of your pipes correctly cross bonded.
If the above is all ok ( and I am pretty sure I forgot some other things) then I would go ahead and install your cable. 10mm or 6mm at approx £5/£3 per meter Plus about an hours labour if straightforward = £40. Plus notification fee to the LABC for a job in a high risk area = £6.00. Total = £56.00
Get your mates mate the "so called electrician" in who will come round in a dodgy looking van with NO signwriting and no telephone numbers on it, not registered with any National Body, probably done just a couple of weeks on a government funded back to work course, who will just turn up and connect your shower up for the princely sum of £20.00 CASH!
Just remember when he has left to check your insurance policy because they are now refusing to pay out on claims from electrical fires if there is no paper trail of recent work done, ie certificates and LABC notifications etc.
Sorry if this is long winded but I had to wind my business up 2 years ago due to being a fully qualified City & Guilds Proper Electrician who done things by the book. None of my customers EVER had cause for complaint and always asked me back to do more work and recommended me to others. Yes I have done cash jobs and continue to do so as we all have to survive but just think of this one last thing.....
..... would you let anyone play around with your gas pipes? Electric is just as dangerous as gas!
Steve - The Other electrician on WikiWirral
In a nut shell really and £40 is a fair rate to pay, if the plumber charges you £60 its more than likely he has put a little extra on for his troubles...
Sanchez - couch potatoe addicted to skyrim!