Stones are units of weight in the Imperial Weights & Measures System.
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Imperial.
A tonne is a metric measurement.
I'm guessing by customary, you mean imperial. if so inches are customary/imperial
A metric tonne is lighter than the imperial equivalent by roughly 16 kg. The imperial ton weighs 2,240 lbs (or 1,016 kg), while the metric tonne is 1,000 kg.
Both imperial and metric is currently used in the UK. The metric system is exclusively taught in UK schools. So, eventually, as children become adults, the metric system will become the norm. Resistance to using the metric system is usually from adults who were taught the imperial system when they were schoolchildren.