By Paul Sandle LONDON (Reuters) -Vodafone is in talks with CK Hutchison about merging their businesses in Britain to create a market leading mobile network that could accelerate the roll-out of 5G services and expand broadband availability. Vodafone said on Monday it would own 51% and Hutchison 49% under the deal being discussed, with the stakes achieved by adjusting ownership of debt rather than exchanging any cash. Combining Vodafone UK and Hutchison’s Three, Britain’s third and fourth largest networks respectively, would create a business with about 27 million mobile customers – more than c…