Week 8 done and dusted, as I was nowhere near home when Laura said to start the 5 minute warm down I just carried on going until I hit 5km. Just under 40 minutes. Then walked home. Very pleased with myself.
Just to edit to say that this was not intentional. I did not plan my route well and ended up a way away from home when I got to 28 minutes so took the decision to very slowly jog on for an additional 11 minutes I must reiterate very slowly rather than walking. Then I walked for another KM as a warm down.
As the others have said in the comments stick to the plan to avoid injury and plan your routes better than I did today.