On 29/01/2018 13:05, jim wrote:

Does retrofitting mcbs into an older wylex "fuse wire" consumer
unit need notification?

The plug in ones don't have the same breaking capacity as te fuse wire
so you may need to check they are OK.

But why bother? I haven't had a fuse wire go in 30 years so fitting MCBs
would be a waste of time IMO.