Gary Jenkins wrote:

I'm not sure a tube type service off peak is really needed. Moving
from four to six trains an hour, as the Strategic Rail Authority is
currently suggesting, seems to be a lot of investment for
comparatively little benefit. It shouldn't be beyond the wit of most
people to plan their journey to cope with four evenly spaced trains an
hour, at the same times past each hour. If someone does just turn up
on spec then a maximum wait of 15 mins isn't that much worse than one
of ten minutes.

Six trains an hour is not a tube style service. It is a start though.