I'd interned before, and I interned again - not unusual to get a job these days, sadly - so working for free didn't really frustrate me. Besides, you're effectively a student for the year, so it's not quite the same.
I loved the year placement. Both Parliament and Congress are really fun and exciting places to work. It's great just being able to wonder around them or give other people a tour. The work was mostly interesting, although obviously there was filing and photocopying and things too. But then there were other exciting things, like seeing the Queen come into Parliament for the Queen's speech, watching PMQs, seeing Obama, seeing Hilary Clinton, that kind of thing. Basically, it was a really amazing year.
I worked for Jonathan Djanogly in Parliament, and Marcy Kaptur in Congress. I can't remember if I ever asked either of the offices for a reference, but I'm sure they would have given me one if I asked for one. After Leeds I went to do a two year MPhil at Oxford. I then went back and worked in Parliament for a while, for another MP, and now I work for a public affairs company. The people who did PPS are all doing interesting things.