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(Pocket-lint) - Sky has posted its unaudited financial results for the six months ending 31 December 2013. It made a £647 million profit in the period, but the biggest rise is in the number of Sky+HD customers who have connected their boxes to the internet.

Thanks to an increased On Demand offering from the broadcaster and more focus on a "connected TV" message, an extra 2.637 million customers connected their Sky+HD boxes to the internet, over one million in the last three months of the year alone.

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That now brings the total up to 4.352 million who are reaping the benefits of On Demand content. Less than three quarters of a million now remain unconnected.

Sky Go also grew in 2013. The number of unique users of the mobile platform rose to 3.314 million in the year, a year on year rise of 248,000.

READ: Sky and HBO extend exclusivity deal to 2020, will now make original shows together

In total, Sky now has over 15 million TV subscribers - 10.536 million standard TV, 5.005 million HD - and there are 33.307 paid-for products in use, a rise of 3.794 million year on year.

Its profits rose to £647 million for the last two quarters.

The company also announced an extension to its exclusivity deal with HBO, which will now run until 2020 and include co-production on new TV series, and a redesigned EPG that will launch in the spring.

Writing by Rik Henderson.