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Was this price just for an additional array of cells?
Basically yes. They daisy chain the original 4 into the same BMS as they max at 8 battery modules per BMS.
The previous 10kWh was part of an install with solar in Jan. That was 18 panels, batteries, inverter and install for £12k and change.
Batteries by themselves are usually about £700 each so about £500 discount and free install although that's really only turning off the inverter, plugging them in and turning it back on but need the install certificate so you'd have to get a professional in to do it anyway.
Added 10kWh to my battery array today. Doubling capacity.
Solar Together were doing a deal so it was only £1,900 installed.
Sets us up to be completely free from daytime grid usage throughout the year and maybe 90% independent once we swap to a heat pump next year.