Can anyone recommend a WiFi booster. My greenhouse ( back of the garden ) is approx. 12 mtrs from the router ( BT ) which is at the front of the house.

Hi Mike, I use a standard TP-link extender which is inside a conservatory about 15m from the greenhouse. It's a thin walled conservatory, which I believe helps the signal get through. It wouldn't go through our thick stone walls from inside the house, just inside the conservatory door.

I have to remember to choose the -EXT wifi network when I want to connect to the Harvst system, as my phone uses the normal router normally.

Thank you very much for the information. I too have a conservatory so it's useful to know where to site the extender.