I know, not about Eberton directly, but there are engineering works planned for the weekend of the SF. Euston to Wembley Park not too bad, but check on the undergrounds journey planner site if you are planning of using it.
We've organised a limousine bus with some spare seats - its very luxurious with lots of leg room, head room & various entertainment systems in 40in Plasma ( for EFC videos ) & Bar.
Mixed ages travelling inc 2 kids so far. Its £90pp better fun & more space ( in 09 stood all the way to London ) than £80 train.