School punishments announced by Michael Gove will not be as effective as waterboarding or a good thrashing, according to educationalists.
The education secretary said that unruly pupils should be made to weed school grounds or write lines.
But public school headmaster Dr Giles Jones said that his school had tried the weeding sanction but still had to employ a gardener.
A Department for Education spokesman said that Mr Gove did not rule out harsher punishments.
'Some pupils might have to attend Latin lessons,' he warned.