This old test board [above pics] has most of the socket outlet variants available at on time or another in the UK
It includes 2A 3pin, 5A 3pin 15A 3pin, 5A 2pin. Top rhs is a batten [surface fitting] holder fitted with a bayonet to 5A 2pin converter, this was so the housewife could plug her iron into the light fitting.The more observant will notice that the lhs B/H is a newer Ashley T2 type, reason?...this board was in use up until 3 years ago when we moved locations!!!... won't pass any tests but I don't want to throw it away. Nostalgia and all that.... [Linked Image]