Measuring: Imperial and metric

Male, brown hair, blue and white striped top: Feet and inches.

Male, black hair and goatee, blue and white striped top: Pounds and ounces.

Male, grey curly hair, checked top: Centimetres, millimetres.

Male, brown hair, blue and white striped top: Milk comes in pints.

Male, bald head, green t-shirt: Litres of petrol, litres of oil.

Female hairdresser, blonde hair, blue dress: Most hairdressers don't realise they do this, but they have to work in inches and centimetres.

So must hairdressers naturally will know if it's 2½ centimetres, which is an inch.

And they automatically swap between the two, because clients will speak in inches and in centimetres.

Female hairdresser, blonde hair, black shirt: I learnt a little trick that if you crease your thumb, this is roughly an inch.

So I always go like this, so that's roughly an inch.

Male hairdresser, black hair, glasses, black shirt: This is roughly an inch, and I'd say that is roughly a centimetre.

Female nurse, black hair, blue and white striped shirt: There are easy conversions, I mean 3 ft is approximately a metre.

A litre of water is 1¾ pt.

Male gym worker, black hair, purple and black t-shirt: All our weights in this gym are in kilos.

Being a hotel we often have a lot of American guests staying and they work in pounds there, so they often like to know a conversion.

As a rule of thumb we know 2.2 lbs is the same as a kilogram.

So for example, a 10 kg dumbbell would be 22 lbs.