Before making a speculative approach to me, please think about a few questions:

1. Why do you want to work with me in particular? I need to be convinced that you are actively interested in working with me, not attracted by the appeal of a degree from Cambridge. Straight “applications” of isotopic analyses to archaeological questions are of less interest to me, and for such work, there needs to be another Cambridge-based supervisor to cover the archaeological dimension.
2. What will you bring to the isotope group? I like people who can bring unusual skills into isotopic studies, who want to tackle underpinning assumptions and to take new approaches to isotopic data. A strong degree of numeracy, a willingness to do a lot of benchwork and an interest in archaeology/trophic ecology are expectations, not qualifications in themselves.
3. How will you fund your position? I do not take self-funded students, because of the need to cover research expenses. Please make the effort to look for opportunities. I’m willing to help good applicants to develop proposals and track down funding but the primary motivation needs to come from you. Having independent funding isn’t enough on its own either; see (1.) above.
4. Why do you want to do a PhD? In case you’re not already aware, most PhD graduates don’t end up working in academia (although fair few of my former students do). A PhD is difficult, intensive - the highest academic qualification for a reason. It brings you no glory, no financial rewards. If you’re aware of all this and still want to embark on this, then it might be for you.