A few more survivors:
(1) The big one
Siemens Full O'Power 1438, ready to take its place in a Roberts P4D, though I think this particular one came from a wartime Ever Ready model.
(2) Drydex grid bias, a tad mouldy, showing again the prominence given the Drydex name over Exide way back when. Not too hard to work out that Drydex signified "dry", and so Exide's market-leading accumulators just carried the Exide brand.
(3) Another GB battery, from "Marspen". Otherwise known as St. Michael's...
(4) A couple more *coughs* D cells. Though their appearance is very similar, the "Leakproof" one has a cardboard outer jacket, while the "Sealed" is in metal. Presumably once the "Leakproof" name had been dropped it made sense after a while to change the number from LP U2 to SP2, as in the SP11 above.
Paul