Might give 'em a whirl, thank you. I like the idea of ordering coffee by the bucket as it happens. But yes, sensible refills are sensible. Also am super cautious about having anything metal that might get left on surfaces by less cautious members of the household to leave rust marks.
You could always grab 2 x 200g cans, then refills, from good coffee cartel. The refills are excellent, biodegradable and recyclable packaging.
https://www.thegoodcoffeecartel.com/shop/cans