They are doing them at a discount price at the moment, it's one of my friends company, they also do a lot for growing herbs and the such. Also Aquaponics too.
Take a look.
http://www.midlandgardensupplies.co.uk/

The concept is very intelligent

Clicked on midlandgardensupplies.co.uk. Says link cannot be found...

did a search and came up with this 'review'

https://www.yell.com/biz/midland-garden-supplies-burntwood-7382135/

not very promising

This co. folded August 2014 - directors names Scott William Smith, Scott Timothy Rabin & Craig Alexander Stevens - only operated for 3 years - ccjs against them.   Another co. owned run by these - Vericare - also in liquidation.

Fungi Perfecti offers a wide variety of Certified Organic Indoor Mushroom Patches?. Each kit comes with illustrated instructions and is guaranteed to produce. Our Indoor Mushroom Patches are fairly simple to care for; all you do is place the humidity tent we provide over the Patch and water it according to the instructions (in some cases, a soak in cold water might be needed to encourage the Patch to fruit). After these indoor kits stop producing, many of them can be used as spawn to inoculate outdoor garden composts and/or hardwood logs