Date   : Wed, 02 Sep 2009 23:46:09 +0100
From   : flynnjs@... (Jason Flynn G7OCD)
Subject: Leccy @ Acorn World '09

> A 32 amp breaker  is only permissible 
because each socket
>  has two cables feeding it from either side of the 
> ring effectively doubling up the rating. (Say 38 amps to be
> on the safe side). Any MCB higher than 32 Amps would be
> asking for trouble.

It's more complicated than that: the cable that should be used
is dependent on the material it is enclosed in and the length.