Ned Ludd is alive and well and living in Bradford. Resistance to metrication doesn't get much sillier than this label from Morrisons (I'm making pork and beans tonight. I'd sooner get the belly pork from a proper butcher but I needed to get at the scrapings of my bank account with my card)
Firstly, I'm not at all sure that belly port is ideal for roasting, but I suppose it would work. That's not the point though. It's the timing suggestion. 25-30 minutes per 454 g indeed!
All right, I know as well as anybody the old rule of thumb of 30 minutes per pound plus thirty minutes. But we've moved on. Get real. At worst, say "30 minutes per pound plus 30 minutes". But 454 g is ridiculous. My basic kitchen scales only measure to an accuracy of 25 g anyway, so aren't going to recognise the nicety betwen 450 g and 454g. They might not reliably distinguish between 450 g and 500 g, and 500 g is what they should have said anyway. Or even easier, one hour per kilo!
It's not as if such accuracy is necessary anyway. The timing is given has a 12% uncertainty and there's a warning about different performances of ovens.
Come on, let's get real. There's nothing to be gained, in an age of international trade and travel, in clinging to the past. Metric measurements have been taught as standard in schools for nearly forty years now. At this point somebody chimes in and says that in French and German markets, goods are sold by the livre and the pfund. Well, fine by me. Those shoppers get half a kilo. If we want to order by the pound, then define a pund legally as 500 g - that way we won't get 46 g shore every time, at least!