A week of West end, Help needed

Hi Everybody,

First of all, i enjoy reading along silently for a while now! and I am sorry to bother you with a couple of questions but it seemed better to put them in one post instead of bothering you in every topic about the shows.
Second I am in need of some help, I will be in Londen for a week in about 3 weeks and I am trying to figure out the best way to get decent tickets for musicals (We're not sure on what shows yet). I know Wicked, WWRY, Billy Elliot, Sister Act, Hair and Av Q do Day seats and are front row or best available and Legally Blonde has a lottery.
1) But for Billy Elliot I have read something about asking for tickets while in the que waiting, but I don't understand, they will be full price then right? and what's better Day Seats or try at TKTS?
2) For day seating for at least Wicked and Hair, what time do you recommend to be there in the morning in late july? (And for Hair does anyone perhaps know the numbers on aisle seats?(or the chances of getting them) Seen the show in NYC and really love to be on an aisle this time)
3) Legally Blonde lottery, i've seen the lottery's last summer in NYC and they were crazy busy! is it the same for Legally Blonde in London? or should I try and find some discounted tickets elsewhere? or is there a weekday that usually is less busy?
4) Phantom, Oliver and Priscilla, what's the best (discounted) way to get the best tickets for this?
5) Furthermore any (Seating) tips on any show are very welcome

Thank you so much in advance for your answers!!

~ Charlotte

www.theatremonkey.com

For Billy Elliot - book it in advance for midweek. Ring box office direct. The best ones are Stalls Row C seats 6-9 and 22-26 - Only £19.50 midweek!!! In comparison, they are £50 on weekends.

Thank you for the tips! I greatly appreciate them!