Some rather dated and dodgy-looking common close wiring, powers 2 lights. The new CU powers the intercom.
The picture with 2 CUs is the flat wiring.
//www.diynot.com/network/OwainDIYer/albums/11843
View media item 44311
The picture with 2 CUs is the flat wiring.
//www.diynot.com/network/OwainDIYer/albums/11843
View media item 44311