The first three referee comments have arrived and they are all very supportive. We are particularly delighted that they ALL recognise the potential of the PiFM facility in Cardiff to create internationally competitive science. It’s a big challenge to write a comprehensive account of the science that a technique like PiFM can offer in limited space, and we were genuinely concerned that the exciting science we plan was not covered in enough detail. Happily, our referees have read the proposal very carefully and understood the case we were trying to make. We are very grateful for their efforts.