Completed week 8 on Saturday night which felt great, I'm not sure what other peoples opinion is on this but i found for week 7 and week 8 I changed the plan slightly.
Week 7 is meant to be 3x25Mins
Week 8 is meant to be 3x28Mins
I've found that doing 25,26 and 27Minutes in week 7 and then 28,28 and 29mins in week 8 for me worked very well!
Personally I've found that moving from week 7 to week 8 and now to week 9 seems like less of a jump.
Its something to think about!