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at least Doc Hudson has one reply for my question :)

Thanks everyone, it was helpful to hear different views.  Finally I found a good electrician.  I will replace consumer unit and go with current regulations. Special thanks goes to Binky :)   , very useful what is ESL?

I have TT, and electricity provider put PME near to consumer unit, but didn't connect to consumer unit, as electrician needs to check if it's ok to do that.

I am in Liverpool, North West

I agree, earthing needs to be sorted.  But can it be done on existing CU?

There is no earthing in house, so PME needs to connect to CU.  It's a TT system (any electrician will know more than me what is TT system)

Yes, they are MCBs (black in colour, and up is ON)

Extractor fan in bathroom, which is on extension in terraced house.  Bathroom has a bulb inside with switch outside bathroom.  I need extractor fan which goes on with light, timer delayed. Consumer unit has 5 MCBs (30,30,15,5,5) and 100mA RCD.

I needed 2 tasks: earthing on TT system, and installation of extractor fan.  RCD is 100mA One electrician says he can't do job, until I get consumer unit upgrade and all tests etc. Other electrician says, it's ok to do job on existing consumer unit. How to know which one to believe?