You've looked for days - so even if you've only just got the quiz, you still had until 12 September to try and find out the answers yourself. As this was about underground stations, the answers are there for all to see, just a matter of logic to sort it out.
There's nothing to say you can't enter the quiz without answering all the questions - after all isn't it about helping the charity and having a bit of fun along the way? If you can't work them out yourself, why not have a guess or leave a blank space - there's no shame in it and it's painless. It is ever so rewarding and satisfying to finish a quiz yourself. What enjoyment do you get from getting someone else to give you the answers on a plate? Sounds like desperation to me?