There's a photograph of a (1950s upgraded) WS 52 in Wireless for the Warrior Volume 2. (I hadn't looked until now.) That shows a pair of Plessey Mk.4 connectors and associated leads to the area of that screwed on plate, but it looks as though the modification was not carried out - if done there was an oval reinforcing (?) ring and alloy plate carrying the LT, a storage tube cap, and HT connectors, plus a warning label reminding the user that the brushes must be removed from the lower dynamotor and stored in the holder when using the external supply.
This carrier has no warning plate, so it appears to have been modified ready for the outboard supply but the set was never upgraded to use it.
Chris.
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