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Free:
Râpé alarm/ body defender (Northcote Road SW11)
It is quite old but might be of interest to someone.

8h
Free:
Plug in power and energy monitor (Northcote Road SW11)
About 10 x 5 cm face on About 6 cm deep including prongs of the plu Plug between your mains and the electrical item, it gives power consumption - instantaneous and cumulative

8h