Waiting lists for Wilsons and SGS

[phantomguzzler]

In the event my DS just scrapped through second stage at these schools and is not offered a place on the first round of offers any ideas going on past years as to how many are on waiting lists? If they both pass roughly 550 boys (and mostly these are the same boys passing both tests) and there are 450 places between the three schools plus independent, tiffins, st.olaves etc. how many may be left without a place anywhere when all is said and done?