I have been informed that there was actually an earlier British home computer! I have never included the "training boards" as computers as they generally had little or no expansion capability, the user being stuck with the buttons/switches/LED display. It could be argued that the claim of "First" may well go to Newbear Electronics for the 77/68 single board unit but I'm not sure when a keyboard and video card were released for it (I think it was sometime in 1978/1979). The basic version of the 77/68 was programmed using toggle switches and lights but it was expandable. I have found very little information but there is a little on
Jake Loddington's web page , with pictures of the main board and 4kB expansion board. However, this machine used a CPU of the netherworld (6800) rather than the good and righteous Z80 so 'nuff said! Having said all that, I still maintain that the NASCOM-1 was the first - simply because it included a proper keyboard and TV output in its basic form: they weren't add-on items.