On 14/08/2016 09:00, Mike Tomlinson wrote:
[...]
Beware that doing this can show up faults, such as shared neutrals, that
don't affect fused CUs. They can result in an RCD that trips and won't
reset.

You're supposed to test and assess each circuit before connecting it to
the new CU.

This is a useful guide:
http://www.electricalsafetyfirst.org...1-Issue-3-.pdf

--
Andy