The easiest way to reach me is via email to Robert.Harle [at] cl.cam.ac.uk. I always endeavour to respond quickly to emails but my inbox does sometimes get rather full. Feel free to follow up your email if you don’t get a reply in a day or two – I will probably appreciate the reminder!
Alternatively, I have an office (SN09) at the Computer Laboratory:
Cambridge University Computer Laboratory
JJ Thomson Avenue
Tel: +44 1223 767019