A pint in a pub is (or at least should be) still a pint (and nothing else). A bar in Norwich (the Belgian Monk), which only sells Belgian beers, was selling its draught products in metric units. They received a visit from trading standards officials, who forced them to switch to imperial measures. That's despite the fact that the pub was (in accordance with the law) selling its bottled products and spirits in metric units (and also the fact that the same trading standards were visiting Norwich market to ensure that all food sales were in metric units).
The building trade still uses a lot of imperial measurements. (e.g. �" screws, 1" nails etc). If a builder orders a skip, he'll quote the size in (cubic) yards, not in metres.
The rail industry still refers to imperial units. For example, the gap between the rails is referred to as the 'four foot' (even though it's actually slightly greater) and the gap between adjacent tracks is the 'six foot' (even though it can be much wider). The distance markers, alongside the tracks, show miles and chains.
A day at the races will also see you encountering imperial measurements, with courses still measured in miles, furlongs and yards.
This might be of interest:
http://en.wikipedia.org/wiki/Imperial_unit#Uni ted_Kingdom
Chris