In the back of my garage/workshop I have a Belfast sink with tap, and about 550mm above the sink is the consumer unit. In preparation for a possible house move next year I've been looking through the regs to check that this is OK but can only find guidance about horizontal separation, which should be >300mm, and nothing about vertical separation distance. The top of the CU is sealed and the front has the usual acrylic cover; the sink is ceramic and the tap and waste are connected by plastic pipes, so bonding isn't an issue.
Are there any regs about vertical separation in this situation?