(Reuters) – British broadcaster Channel 4 has warned the government its privatisation would cost the economy 3 billion pounds ($3.92 billion) and also put independent producers out of business, The Times reported on Friday. The publicly owned but commercially-funded broadcaster presented Culture Secretary Nadine Dorries with documents laying out the drawbacks of a sale, the report said. The documents set out an alternative to privatisation, giving Channel 4 access to private capital and preserve its public remit. Dorries, however, rejected the proposals this week when she announced plans to pr…