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Left is one of these:
https://www.sparksdirect.co.uk/ip66-black-junction-box-weatherproof-square-outdoor-junction-box-with-8-cable-entriesRight is one of these:
https://www.electricalironmongery.co.uk/product/terminal-metal-conduit-box-stop-end-box-20mm-galvanised/They should be attached to the wall, not buried in a flower bed, obvs.
One or both may be switchable from inside your house somewhere.
What are these that I've found half buried in a bed?