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I know DNOs in some areas were putting in 60A main fuses in 100A supplies. I assume to discourage excessive use as their system overall cannot cope. Like some here, I assume this is a 100A supply with a 60A fuse. So a 100A fuse would not harm anything.
If the DNO a number of years back did downgrade the fuse, then it would be matter of slotting a 100A fuse back in. Even if the DNO does not know. How naughty.
If the house was orginally 100A, then they downgraded it to 60A, then they have to upgrade at their expense?
Cut out might be rated to 100A, but if a 60A fuse is fitted it's a 60A supply.
In other news, I'd suggest not going down the route you seem to be headed - especially after posting images that identify the property in question to any DNO employees who might stumble upon this thread.