Barry's notes, a variation on John's culture:
Pot grown - 10ins clay. 
Potted 20th May in 50 / 50 multipurpose and JI No 3 with extra Grit.
Stopped 10th April. Flowered 2 up full bloom 13th September.
Plant habit not lush almost spindle like, from securing Bud they take a long time to develop. Because of the lightweight structure of the plant I did continue to liquid feed (101) up to half out. No sign of spotting.

U.K. Regional Stopping guide
The dates we choose for stopping our chrysanths can never be guaranteed to produce flowers on a specific date for a specific show, weather conditions and other factors (such as garden aspect, location, cultural routine etc) will all play a part in influencing speed of plant development following the stop. The following information relates to stopping dates for producing blooms for Shows during the first half of September and are offered as a start point for new growers. Adjustments should be made for later or earlier shows.