Info on the switches I use is here: VFAQ: Lighting Control Options for UK SmartThings
I have since done more, and now use the Schneider grid system in some places. I have some doubles, and one quad. I also found a solution for a chrome momentary architrave switch if you ever need one!
As for PIR and outdoor, I don’t currently have anything. I have heard that the best way is to use a ‘dumb’ device with a relay or something else similar, as the current offerings of zwave and zigbee devices aren’t really up to outdoor use (too many false positives).