Manned by
158 Battery of 53rd (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery, perhaps a visit to the Public Records Office my bring up a few pictures:
From Wiki
The regiment was embodied on 5 August 1939 and occupied gun positions in parks and open ground around London: 157 Bty at
Southwark Park and
Brockley in south-east London and at
Gunnersbury Park and
Hurlingham Park in west London; 158 Bty at
Hyde Park and
Wormwood Scrubs, with its HQ at
Fairlop and also occupying various sites in
Essex east of London; 159 Bty with HQ at
Finsbury Park and sites at
Friern Barnet in north London. In early September, elements of 88 AA Regiment took over 157 Bty's positions and the battery moved to
Bramley, Surrey where it came under
5 AA Division. Thus the regiment was fully deployed when war was declared on 3 September.
No pictures I'm sorry to say, but I have some interest with 159 Battery of the same regiment when it moved to Bramley, the site of one of the major Ordnance Ammunition Depots.