I tried this method again last night.
The result was a very clear dream, with lots of easily remembered events in.
Dream was of someone going up a steep pathway to save some stranded schoolkids.
After splitting the kids up into groups of 12. Each group with one teacher in charge, they were led down at intervals of 2 min's
This had nothing to do with my intended dream, but the results were very clear.
Looks like this method gets you into a state where dreams can be recalled more easily.