The Suttons Autumn Catalogue new for 2023 Page 63 four different Large 7.5 litre Mushroom Kits.
I have a Large 7.5 litre Mushroom kit sitting in my broom cupboard office and I will be growing mushrooms shortly as the days get shorter, the nights get darker and the cabin fever and lack of being able to grow much of anything takes hold.
Mushrooms can be grown all year round which is a good thing for those of us that get growing withdrawal symptoms.
The "Brown" and "Chestnut" appear to be the same mushroom it's just that the KB9281 - 7.5 Litre kit in the Autumn Catalogue it's called "Brown" and the KC1121 - 3 Litre Kit it's called Chestnut for some reason. Both codes lead to a single web page for the Chestnut!