UK Opinion on these pics please

[Apple1973]

Hi,
I am the wife of an electrician feeling absolutely gutted. We have had a complaint from a customer who is seeking a £500 refund for a consumer unit change that my husband undertook for her. I joined here in the hope other electrician's could shed some light on what's happened as I have no clue what consumer unit wiring should look like. I can't confront my husband over this at the moment as his mum is dying and I don't want to add to his stress so I am trying to figure it out myself. My husband has been an electrician 30 years. He is a part P domestic installer, Niceic registered and 18th edition updated last year. We have hundreds of happy customers since he went self employed 2 years ago. I do all his books and customer communication etc and he has never had a complaint up until now.
So basically he started on a job where there were other tradesmen present , including another electrician who was retired .My husband did lots of various electrical jobs for this lady who paid us promptly after each installation and was very happy with his work ,even leaving a good review on Google ads for him ..but then something happened, roughly 4 days after he replaced her consumer unit she called us to say it keeps tripping. He went back over there to try to figure out what was happening and spent half the day there. He came back very frustrated saying he couldn't figure it out. There were 5 other tradesmen there,( the place is being renovated) including this other electrician who apparently couldn't understand why it was tripping either. My husband said he ended up ripping all the wires out in order to get to the bottom of it. ..It ended with my husband telling the customer he was completely stumped and that she should get a second opinion.... I then get sent these pictures a week later from the customer of what she says is my husband's work. I am baffled! To me it looks a mess but I realise she probably took this photo AFTER he dissected it for the tripping fault??
Please can anyone of you guys offer me some opinions here as I'm really distressed by this.

 

[Timbo]

We could have a register like clowns have for registering their face makeup .

We do seem to get a few clowns round here!

 

[joelee131]

Tidiness is a good practice, does not mean its unsafe. Did he do a full wiring test before changing the CU? I don't think you can just go and change the CU without doing a full test, as that will classify as an installation and should be notify. The test will help you to identify any wiring issue(s) and correct them before making the change. This will eliminate any issues like tripping. Any un-use MCB should be taken out and blank off not tape off, just good practice. I will not leave any flammable material such as paper under the bus bar, any arcing due to loose termination is a fire risk. You need to get your husband back to the job to fix any issues related to his work, its only fair to the client.