Thank you to everyone once again for your help. I'm afraid non-TW stuff has delayed me for a few days, but now we're back on track to make the release this week.
I was just looking at Springer's collection of the entries at https://tw-logo-contest.tiddlyhost.com
. My first thought was that I regret suggesting that I should choose the winner because it's too difficult with so many excellent entries.
Two entries that particularly caught my eye are Springer's:
I was just thinking that it would be nice to have those two designs combined when I came to this thread and saw Springer's mashup which seems to be pretty much what I wanted:
So, I am happy to declare that we have a winner. Congratulations to Springer and Mohammad, and my sincere thanks to everyone who has entered.