Do tails HAVE to be upgraded?

[amlu]

wait for the dno to fit isolator, see if they are happy with existing tails, if they are leave it alone.

 

[Engineer54]

The customer paying for a professional electrician would be less than impressed when they need to rip out the 16mm tails and 10mm earth and start again...​

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You could also make the argument, that the customer is paying for a professional electrician to KNOW the difference between what is and what isn't required. And not be billed for something they don't need or require!! lol!!

Bunging in 25mm tails on a 60A supply is lunacy, and what i'd expect from a electrical trainee that doesn't know any different, and that has to get he's clues from a guidance based book, that expects/assumes an understanding at least, of electrical theory!!!!