I don't know what they've been smoking at the Electrical Safety Service these days!.
But, let's just get one thing straight here,
There is no way that any Electrician here would run a 10A socket-outlet on a 25A breaker, that's for sure.
Even though a circuit like this would be run in 1.5mm(16A) or 2.5mm cable(20A), the loss of the rule mentioned above, opens the whole subject up to a dangerous situation with cables being overloaded beyond their design loadings.
BTW, the 27A MCB was used for 4mm before we changed over to (ahem) International fusing sizes.
And 25A, is still only allowed for 4mm and very short runs of 2.5mm to permanently connected appliances.
[This message has been edited by Trumpy (edited 02-26-2004).]