On Tue, 19 Nov 2019 17:39:03 +0000, Andy Burns wrote:

lugging cylinders that aren't far short of 100 kG (2 cwt, 15
stone)
when full as you buy 47 kg of gas.

Don't think so, flogas say the tare weight is 34kg

34 + 47 = 81 kg (1.6 cwt, 12.75 stone, over 3 standard bags of
cement).

Calor say 95 kg full for their 47 kg cylinders. Mind you they have
quite a spread for tare weight 29.5 to 57.7 kg.

--
Cheers
Dave.