Just completed wk5r1 kept pace down on first 2 runs then to my amazement I was able to pick up speed a little and complete final run comfortably even adding extra half a minute to reach the end of the lane. First run where I wasn't struggling on last run. Thanks to advice I slowed down and thanks everyone cos it really helped. So hot now and red as a postbox. Off for a long warm shower and looking forward to my next run.