I applied for my C1 renewal at the beginning of April and took a treadmill stress test on August 6th. I now have a letter from the DVLA asking me to have a DSE (dobutamine stress echocardiogram). The letter makes no reference to the previous treadmill test only stating that it is based on my medical history. Has anyone else been sent down this route? The consultant at the treadmill test said that the ECG had shown "some changes" during the test but did not expand on that. I thought the test went well but presumably this has caused the DVLA to want more tests. I've no idea what concerns they have or whether I should be worried about it. How do I find out? In the meantime my prediction of not getting my C1 renewed by Christmas (if at all!) looks like coming true!