Put a small £5 powdered fire extinguisher in the downstairs place where all electrics and plumbing have their isolation taps etc in block of flats . So less likely to be stolen.
So cheap I put one in my kitchen cupboard too. Think you just pull cord and point. All five flats are electric only. Put googles with them so some moron doesn't shoot himself in the eye. If they do I'll just deny putting it there. Just tell everyone orally so I cant be sued. Seems madness to not have extinguisher in block