John Lewis aren’t a big paint manufacturer so I’m guessing it’s toll manufactured by someone else, whether or not that someone else is anygood is a complete guess.
For that price you could be going to a dulux decorating centre and picking up trade diamond matt which is really good quality* and lasts well. Dulux trade is thicker/more concentrated (higher PVC) so covers better with less effor (although I think the main reason is that all painters seem to want to thin the paint back so they just remove some water to make them feel like they have control over what they are doing :-)) You can really scrub the diamond stuff and its suitable for kitchens bathrooms, high use areas or anywhere you don’t want to paint again in a hurry.
*Biased because I work for AkzoNobel, All views my own. I do however use Dulux to paint but mainly because I get a massive company discount.
I work in industrial coatings (bridges, oil rigs etc. not decorative).