I've stopped using Alan, as in my experience their compost grows lots of bloody mushrooms in places where I don't want them as a result of the amount of spent mushroom compost their suppliers mix with the composted food waste and other crap.
I bought 12 bags of the stuff last year and had to sieve every bloody bag ending up with two builders buckest of plastic, unbreakable lumps, stones and even bits of glass.
If you want cheap potting compost, stuff plastic bags full of dead leaves (tight as you can), seal/tie off and chuck them under the hedge for a few months. They rot down to wonderful compost.
It's for comparison shopping. Which is better value, a container holding
60ml for £2.00 or one holding 100ml for £3.50? If the shelf label shows the price per ml or per 100ml or even per litre, then it's obvious which one is cheaper, even if you are arithmetically challenged. The supermarkets are required by law do the same with all goods sold in containers. It can get silly when you buy a kilogramme of margarine, and the shelf edge label has to say something like "£3.00 per container (£3.00 per kilogramme)"
It is even sillier on Amazon where all sorts of things have a price per kg. Like hair dryers and books (I CBA to check for real examples - they are so weird but difficult to find on purpose).
But not to the smallest of units. Per 100ml seems common for items sold in small quanities, per litre for larger quantities.
The B&Q per ml price was for something sold in a 400ml can. The reason I noticed it was because it wasn't in small print. The 1.1p per ml was in a font size equal to the price of the item.
Except even then, supermarkets have sneaky little tricks. I've noticed they mix up the scalar units, to mislead the arithmetically challenged*. Pricing one brand in £/100g and another next to it in £/Kg.
Another trick is to price larger packs more than smaller packs, playing on the publics intuition that per item, a 10 pack of something is cheaper than a 5 pack. Quite often I have found myself buying two packs of something, rather than the larger pack which is twice the weight, as it's cheaper that way.
*There's a sort of nobility about people who are so ****ing stupid. A few weeks ago I was shopping, and was asked by a lady to pass a large box of Weetabix (48), as my trolley was blocked in against the shelf. I did, and happened to notice that there was a promotion marked which made 2 smaller boxes (24s) cheaper than the single large box. I pointed this out, got a withering look, and told "yes, but I want 48" as she sashayed off.
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