25. We won them in '45 & '66. Austral. slang no rules at all. 50. This one was the Queens mother. 92. Use transistors or valves. 98. After cold spell it comes very hot. 106. Anti-aircraft fire, cheat or deceive. 115. Two chasing bus or train twice.
I've seen No. 50 asked several times, but I don't think anyone has come up with a convincing answer yet.