One World Built On A Firm Foundation
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No best answer has yet been selected by boyfox30. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Unless there is a difference between England and Scotland, I don't believe there are any restrictions on the measures these products can be sold in.
As you mentioned, the law only covers the sale of Gin, Rum, Vodka and Whisky.
Theoretically a pub could serve you a 5ml measure of Baileys and charge for it!
The only difference would be if the premises had a bar tariff stating the measure each product was sold in. In that case those measures (whatever they may be - and no, they wouldn't have to correspond to the bar's licence for serving the four main spirits) would have to be adhered to. If this was flouted it may be a case for trading standards rather than weights and measures.
The law only stipulates the measurements for sale of gin, vodka, whisky and rum in the chosen measure of either 25ml or 35ml.
However the requirement for price lists is that all drinks must be listed at the chosen measurement for consistency and comparison of price.
Therefore it is possible to sell others at any measurement you wish.
The measurement requirements do not apply:
"when a drink containing whisky, gin, rum or vodka contains a mixture of three or more liquids."
"When a customer specifies the quantity of these spirits required in a mixed drink."
"There are no prescribed measures for other spirits or liquers. However, only metric measures may be used on price lists."
Quoted from the BIIAB Handbook for the National Certificate for Licensees (On-Licence)
Hope this helps