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Thanks Chris. I see what you mean. Interestingly it works and there is no interference. However, I notice some anomolies/inconsistencies with the design tool I'm using. Just last night while playing around with component values and input types it reverted back to a square wave with the settings in the image below. Not to blame the tools, because I am a rank amateur with electronics. As you have pointed out this is just a switching circuit. So this has caught me out.
I have another program which is spice based but a pain to use. I will try that and see if I can replicate the behaviour.
I have tried to avoid use of the second transistor in this case but I think the program is displaying the previous behaviour. Got quite excited but it looks as though I need to go back to the drawing board.
Still on L plates.
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