Well, despite being a day later than planned (due to journey times to and from work being doubled following the tram crash in Croydon), I went out when I got home from work today and managed the final run fairly easily. It was the coldest run I have done, but this didn't seem to be a problem. kept my buff over my mouth and nose until about halfway through the first 3 min run (until my face was too warm!) and that seemed to work
Week 4 starts on Sunday....!