Here we can see the side of the A4 with the Econet module successfully installed.

I don't yet have a lead but I was able to test it using the Level 4 software I have, one of my SJ Research Clocks and my previously very-ill BBC Model B.

I cut off the end of an Econet lead and bared the wires and inserted them into the holes of the A4 Econet socket. Surprisingly it worked very well! It was very interesting to have the BBC Model B navigating around the A4 hard disc.