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This one maybe cheaper. https://suvastika.com/the-mcb-testing-machine-a-valuable-tool-for-su-vastika/

Admittedly but this was basically a real life situation let to run with a real loose connection fault creating a real arc that could cause a fire.

I tried a Hager AFDD on both radial and ring final with various currents connected via a socket outlet. My conclusion was that they make little contribution to safety.

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It may end up looking like a mess as well as being non compliant. As said replace with spd rcbo unit. What earthing system is it ? Is the 100ma rcd the only one protecting the install. ?

IF (big if) he's registered, I would complain. Get a competent electrician in.

It may determine if anything is actually Live. The real way is obviously to call a decent electrician in.

Get yourself a non-contact volt stick and see if any part of the computer lights it up, not a definitive test but better than nothing. I'm assuming your keyboard is plastic with no metal exposed parts.

https://professional-electrician.com/technical/guidance-on-installing-equipment-within-meter-enclosures-niceic/ https://www.voltimum.co.uk/articles/guidance-equipment-meter-boxes-0 I think that's a definitive NO.

Is that what you would advise your customer to do if faced with the Dno wanting the space ? Or would you get the customer to call you so that you could tell them.

“While the meter cabinet is the customer’s, it is a space designed for the use of electricity industry apparatus only and no allowance is made for additional equipment. For safety reasons, we would not recommend that any internal wiring, including a consumer unit, is installed within the...

DP rcbo is most beneficial in a TT earthing system where an upstream rcd is being used.

That’s true but a DP rcbo will isolate the circuit that causing the trip where as an SP one won’t.

A N to E fault can trip random rcbos.

Nothing wrong with a well designed radial circuit/s in a kitchen .

You implied by your post that a kitchen was a special location but I’m not going to dwell on the point.

An Sp rcbo will not clear an N to E fault.

Is a kitchen in England classed as a special location ?

That would only be true when using DP Rcbos I have split these posts (From "Need help, old fuseboard changed...........") so the debate can continue. They will only serve to confuse the OP

Get a decent electrician in. You can see from looking at the installation of that board that whoever did it is to say the least slap dash. I'd like to see a pic of the innards.