Come on Andrew.. Fourier series and integral transforms should be a piece of cake to Imperial College students!(?). On another note, I will be applying to Imperial College (I'm about to submit my application) for PhD in the theory group. However, given that I did my honours thesis in cosmology (quasar reionisation, with Stuart Wyithe at Melbourne Uni), it would be great to know about any opportunity in the astro group. Cosmological parameters from CMB sounds like some cool stuff to work on! :)