It may not look like much but I got some important work done tonight. The Pro Mini, ESP8266 and SD card are in place and working well., the Pro successfully reported the list of files on the card and the ESP connected to my WiFi network and served up web pages whilst also communicating with the Pro. I was also able to confirm that in-circuit serial programming works while the Pro is connected, the ESP still has to be removed from its socket but it's not really needed for that chip anyway. This was also a good test of how well Perf+ prototype board handles these types of circuits. I gotta admit, it's been very easy to work with and extremely forgiving when I've made the odd mistake.

Next task: getting my modified version of the Teacup firmware working on the Pro.