The second is this old GPO key. In this video, my CQ is answered by EB5GGB, who is also using a straight key to complete the QSO:
In the third video, I am using some form of old army key, but I don't know anything about it. Perhaps someone who knows a little bit about this key could comment below with information, or send me an email? Again, my CQ was answered immediately, this time by CT1CPP, who was also using a straight key, which was a great joy.
I have to admit to being a little bit heavy-handed with my keying. I don't have the best fine motor skills in the world, so can be a tiny bit awkward. However, I had great fun using these keys and I look forward to trying out more and making further videos.