Ray,
After some thought, I have decided to try a EoP setup because there is no easy way to run etherent cable into the back garden. If the two poerpoints are on the same circuit (I have two) than this setup might be more stable than my current wifi setup, and it that’s the case, may switch to an OpenSprinkler so any new home owner does not have the added (and fun) challenge of the Raspberry Pi setup.
I’ll try to keep updating this thread with my progress so others can see how I go !