norn irn; sorry I must have gone over your head on the lack of quality control with Limey vehicles like the Limey Lemon LandRover I own. It gets a Kotex change out every 10 days to keep the painted driveway oil clean. My 41 year old Ford Pickup is leak free, even the DMC manufactured in your neck of the woods is leak free. I was in fear of first the crazy asking price of that container you posted plus the British quality control due to their past preformance on their products especially their vehicles or lack of.
Check into the DIY section where one member added tire valve cores to 2 liter plastic bottle, this was a 30 second job to drill and add the core to the cap. I find this a lot cheaper and handy to transport bier to parties like you asked about in your starting thread. Valve cores just over a $1 USD each, 2 litre bottles we recycle all the time. I find this a winner hands down vs that container you posted. I was in Ireland during "the storm of the century" back in 87 or 88 looking for the DMC factory.
Cheers mate.