The case of Matthew Hedges should prompt all universities to reflect on the role of ethics committees, and PhD supervisors, in the process leading to approval of potentially dangerous overseas PhD research (UAE frees British academic but insists Hedges was a spy, 27 November). As a recent member of a University of York ethics committee which dealt with political research, I frequently encountered such applications from PhD candidates. These requests were often accompanied by reassurances to the effect that – like Matthew Hedges, who spent his childhood in UAE, where his father still lives – the researcher had roots, or close connections, in the country concerned, and that these would be sufficient to protect her/him from dangers which could otherwise affect less well-connected people.

The Hedges case, and that of Giulio Regeni, the Cambridge PhD student murdered in Cairo in 2016, should lead to all those involved in considering high-risk overseas research applications to carefully review their processes.

Steven Burkeman

York

• If an Emirati came here and was snooping around and asking questions at GCHQ or RAF Mildenhall or BAE, would we not react exactly as the UAE has done? Yes, there would have been a fair trial, one hopes, but we would certainly have arrested such a person. Questions need to be asked of Matthew Hedges’ university.

Jane Ghosh

Bristol

• Join the debate – email guardian.letters@theguardian.com

• Read more Guardian letters – click here to visit gu.com/letters

• Do you have a photo you’d like to share with Guardian readers? Click here to upload it and we’ll publish the best submissions in the letters spread of our print edition