Thanks! It was completely unexpected because of my lack of WE... I'm terrified that it was just a computer glitch! I've done 2 full summers of Investment Banking internships, one of which was at a really competitive bank, as well as three volunteering trips (one month max. though). In my PS I explained why didn't want to go into Finance but talked about how much I'd learned from those experiences (esp since I'm interested in micro-credit, etc). I also talked about the specific organization I'd like to work for this summer, so maybe that showed that I was aware of my lack of WE but trying to catch up? I'm not sure....
I have a strong academic background from a top 5 UK university and I discussed my dissertation research (development economics) in my PS, but I didn't think that would be enough to compensate for the lack of 'real-world' experience given SIPA's reputation.
Do you mean the joint-degree in which you do one year at LSE and then apply to do your second at SIPA? In that case, I am considering it but apparently it's a completely separate application process so they don't take into account whether SIPA's accepted you before. Not sure if that's what you meant! I could risk it, but I also wonder if it would be better to get the 'full experience' at one institution rather than splitting my time between the two.
Congrats to everyone else who got in!