has been considerable, Chairman my one concern which has in fact shared by Mrs  as Mr  referred in, in his letter is erm how long is this experiment should run for erm how long five point seven the first of three months, although the wording isn't, it is in fact half the recommendation, I would want to er agree with Mrs  suggest that this be six months, erm because three months particularly in the winter months can't, can't really be considered a very thorough experimental period.