On Oct 3, 4:07*pm, "Phil L" wrote:
having a 50mm ovberhang is going to cause problems, not least for the
plasterer!!

It also means cables can not be routed over it - assuming it is in the
150mm Ceiling Zone.

Without the 150mm Ceiling Zone you have to drop cables down the Corner
150mm Zone, run across the wall in a Horizontal Zone created by 1G 2G
backbox with blank plate, then back up into the 150mm Corner Zone.

Something to bear in mind re impact on other services... :-)