Yeah! I got that in Tesco's in Oban a few years ago. Told them they'd lost a good customer. Went across the road for a year or two. Not had a problem recently.
Usually use both stations in Lochgilphead, one 20 litre gerry can in each, and fill up the car. Back home I siphon as much as I can out of the car.
These rules only come in during the tourist season, when they can always sell plenty of petrol. They're forgotten in the winter when times are hard.
Also noticed the trend of fuel increasing in price as the summer unfolds, so we all have to pay more for our fun. 'They' must think we're stupid, when we know it is they who are so if they think we don't remember these things come election day. Vote UKIP