£6billion is the figure they would have had to pay over the next few years if they had not reached a settlement with HMCR. (Try telling HMCR that when they come after you for immediate repayment of the £2,000 they mistakenly underassessed you? )
The Indian authoriities are unimpressed and are still demanding payment of $2.53billion from Vodafone in back taxes relating to the takeover of an Indian subsidiary three years ago.