"RWE npower participates in the generation and supply segments of the electricity industry.

Up to March 2005 the electricity industries of Scotland, Northern Ireland and England and Wales operated independently, although interconnectors joined all three grid systems together. From April 2005 under the British Electricity Trading and Transmission Arrangements (BETTA), introduced in the Energy Act 2004, the electricity systems of England and Wales and Scotland have been integrated."

These have to be the guys to contact.

It's a sure bet that the monopolist is unifying all technical standards.

RWE would have to know if any legacy fuses remain in their distribution grid.

" fuses used ever..."

Is pretty absolute.

You need to go to the source if you want to have any confidence in an answer.