It states quite clearly that the operator, the company known still as Camelot, was sold. It also says that the company had been in private i.e. not government, hands since 1994.National Lottery operator Camelot has been sold to a Canadian teachers' pension fund for £389m.
The company, currently owned by a consortium that includes Cadbury, has been running the UK's National Lottery since it began in 1994.
So I repeat, and as Freddo has also said, the National Lottery belongs to the state, and the government at the time licences the winning bidding company that tenders to operate the lottery on behalf of the government.
There is plenty of articles on the internet that will confirm this. It belongs to the state, and as long as a company (or a pension scheme in this case) is deemed fit and proper to operate the lottery, the government will allow it purchase the company that currently holds the licence. That is what happened in 2010, and from memory, I believe that Camelot won a further tendering process between then and now.