In that case check the taps washers. https://www.screwfix.com/p/monument-tools-tap-reseating-tool/89487 https://www.plumbcenter.co.uk/product/center-tap-reseating-tool/
But I'd check that all isolating valves are fully open.
Flatmate says the kettle exploded (sparks and stuff everywhere) today so definitely calling the landlord to check that out. He can sort out the tap at the same time.
Did the landlord provide the kettle?
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In that case check the taps washers.
https://www.screwfix.com/p/monument-tools-tap-reseating-tool/89487
https://www.plumbcenter.co.uk/product/center-tap-reseating-tool/
But I'd check that all isolating valves are fully open.