My school reduced contact from 10 one hour periods per fortnight to 9 and now subjects studied by a small numbers of students have either 7 or 8. It is difficult to get through the content at AS but no great problem at A2. Results have improved slightly but correlation does not imply causation. Big saving financially - a fairly accurate rule of thumb is a saving of £1000 per year for a one hour reduction for one class per fortnight. It is a neat way to address a potential budget deficit.