There seems to be mixed opinions on the minimum distance a socket can be from a sink, some think it doesn’t matter if it has 30mA RCD protection and others say different, but the truth is all socket outlets should be protected by a 30mA RCD anyway.
There are various guides, recommendations, drawings and diagrams showing distances of sockets from kitchen sinks but all of the guides state “recommended distance” there doesn’t seem to be anything which says “a socket outlet must be at least xx away from a sink or drainer”