In article .com,
"Rob" writes:
Just found out that extending a ring main with junction boxes is now no
longer allowed in the IEE regs.

You found out from an unreliable source.

Whats wrong with junction boxes? The floorboard above them will be
screwed in place and not nailed and marked as an access point for the
junction boxes.

They have to remain accessible, otherwise use crimps.

--
Andrew Gabriel