Today's Tech: Apple's iPad and iPhone lose ground to Samsung in China and TalkTalk intros child filter to Google's Android OS

The number of tech jobs up for grabs in inner London and southern England has almost doubled in four years, according to new figures published by recruitment firm CWJobs. Second quarter figures for inner London vacancies have increased from 5,736 to 9,886 since 2009, whilst southern England has grown from 15,944 to 27,421, and outer London from 14,899 to 23,365, contributing to a five year national high. East London's Silicon Roundabout has unsurprisingly been key in boosting tech job availability in inner London, whilst outer London has been helped by Croydon Tech City, and the south by Cambridge's "Silicon Fen" area along with Bristol's development of a computer gaming hub. However, job growth is showing signs of slowing and not every area in the country has benefited. Despite year-on-year growth of 2.4 per cent in inner London for the last quarter, the south has experienced its lowest yearly growth in tech vacancy numbers in the past four years. In contrast to the success of the south, the north east has experienced a steady decline in available tech jobs, falling from 3,691 in 2009 to 2,833 in 2013. The north west has also slightly dipped.

Hewlett-Packard has swapped Wall Street darling Dave Donatelli for chief operating officer Bill Veghte to head its Enterprise Group, following another disappointing quarter which saw the computing giant's sales dip eight per cent year-over-year to $27.2 billion (£17.4 billion). HP, which reported its fiscal third-quarter earnings this week, is now at a critical juncture in a five-year rebuilding plan which started at the beginning of 2012, according to CEO Meg Whitman. As the company moves into a new phase of that process, Whitman said she had determined that HP's enterprise business was changing and required new leadership to reflect that shift. "Bill Veghte has been our COO and brings a tremendous amount of software expertise to a business that's now more dependent on software," she said. Whitman described the executive shuffle as part of an effort to "accelerate into the next turn" of HP's rebuilding effort. The company's third-quarter revenue slide saw sales dip from $29.7 billion (£19 billion) in the same period a year earlier, a decline Whitman and chief financial officer Cathie Lesjak attributed to a moribund PC market, flat global IT spending, and pricing churn in the datacentre market. Whitman offered a fairly grim assessment of the current PC industry, which been severely challenged by growing global demand for powerful smartphones and tablets now being used to perform computing functions which were formerly the sole province of desktops and laptops.

TalkTalk is now offering child safety filters to its mobile customers. The ISP's MobileSafe app is free for TalkTalk mobile customers, but only works on Android devices, reports PC Pro. TalkTalk said that it's only focusing on Android for now as the Google OS is the most popular among customers, and "poses the biggest security risks" to users. A growing number of risky apps have been found in the official Google Play app marketplace, suggesting TalkTalk's Android-first approach is wise. Android is also found on the most smartphones in the market, with the likes of Samsung, the market leader by volume, relying on the OS for its key handsets. The mobile app from TalkTalk has been built in partnership with security software company F-Secure, and is said to take up 10MB of a phone's internal memory. Parents may choose one of three categories of "child", "teenager" or "adult" to filter sites via the browser.

Apple's share of the Chinese tablet market plummeted in the last quarter, with rival Samsung and a number of smaller domestic companies making further gains. In the second quarter of 2012 Apple made up half of all tablet sales in the country, in Q2 of this year, its share had fallen to 28 per cent, according to data compiled by Dickie Chang, a Hong Kong-based IDC analyst. The iPad remains the most popular tablet in the country. Although Samsung surged into second place, the firm still only holds an 11 per cent share of the market. Apple's downward tablet trend does however mirror the fortunes of the iPhone, which has seen its market share almost halved in recent times - consumers are being pulled towards cheaper devices running on Android. A large amount of the market share lost by Apple went to Chinese tech firms. These small manufactures, each of which have one per cent of less of the market share, now together account for 50 per cent of sales in the Chinese market.