Imperial College London is based in South Kensington which is a really nice part of London. I usually get in around 9:30 and after a few minutes of gossiping/checking email/facebook, I get down to work!
The main portion of my job is research, and I try to have one primary project on the go at any given time, although occasionally ideas will crop up and I will be working on multiple papers.
My research involves a lot of computer programming. I work with data from the magnetometer on the Cassini spacecraft which is in orbit around the planet Saturn. I plot out this data using computer programs, and study the magnetic environment around Saturn, looking for unusual deflections of the magnetic field etc. and trying to interpret what they mean.
On any given paper that I write I usually have several co-authors or people that I am collaborating with, so I talk to them over email, teleconference, or face to face at meetings, and we discuss ideas and interpret the data.
Another portion of my job is teaching, and I currently demonstrate in the first year undergraduate labs, and also run small projects for undergrads in the summer term.
At Imperial, we are the Principal Investigators on the Cassini magnetometer instrument. We have a team of spacecraft operations people who send commands to the spacecraft, and process the data that comes back.
We have had an extension of funding for the Cassini mission so I am currently involved with planning the trajectories for the extended mission. This means that I work with spacecraft operations staff at Imperial, but also those based at the jet Propulsion Laboratory, part of NASA in California. Because they are 8 hours behind us in California, that means I have to stay late one night a week to have a mission planning teleconference with them.
So when I'm in London, a typical day is research, some teaching, and the occasional teleconference. I then attend international conferences a few times a year where I present my work, so I have to prepare talks or posters for these. I also give talks at schools, local astronomy clubs etc.