Guide to spelling, punctuation and grammar

Opening paragraph
There is no doubt that the sports industry in this
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country has grown massively over the last twenty
years. 
(1)
This growth is linked with the development
of cable and satellite television channels, many of
which supply continual sports coverage to
subscribers. These channels earn huge revenues not
only from subscriptions but also from advertisers who
rush to advertise their goods and services when
important sports events occur. The governing bodies
of the various major sports in Britain, such as
football, cricket, rugby and tennis, have cooperated
with the television companies in signing agreements
to allow the televising of their ‘products’. 
(2)
Thus, the
amazing hype that surrounds major, or even run-of-
the-mill, sporting events stems from the pooled and
vested interests of the owners of the media outlets
and the groups who control the sports themselves.
This continual high-intensity marketing of sport has
led to a nation of obsessive watchers, most of whom
are male. 
(3)