SDL climbs on change at the top In the wider market, politics were a factor as traders looked ahead to tomorrow's closely-fought US election, with some analysts viewing Republican contender Mitt Romney as more business-friendly. Uncertainty over the outcome and the implications for US tax rises and spending cuts due to come into force in the new year helped send the FTSE 100 down 29.49 points to 5,839.06 in light trading volumes. Disappointing services data from China, the world's largest consumer of industrial metals, did not help and inevitably dragged on mining shares, which have a heavy weighting in the blue-chip index. Eurasian Natural Resources Corporation was the biggest blue-chip faller with a decline of 12.2 to 321.3p and Vedanta Resources, which unveils its first-half results on Wednesday, lost 42p to £11.18. European politics were not far from investors minds" either, with worries over the outcome of a parliamentary vote on Greek austerity, due this week, also weighing on market sentiment. Weir Group topped the FTSE 100 with an advance of 80p to £18.31 after the engineering company said it was "on track" to meet full-year profit expectations. BG Group, which disappointed with its own trading update last week, dipped 3p to £10.88½, having fallen 18pc since announcing production growth would be flat next year. That led some in the market to speculate a bid could be in the offing, and today Nomura was the latest to suggest the company may be vulnerable. "The dislocation between the underlying value of the asset base and the current share price is too wide," the broker said. If the management team are unable to unlock that value, there will be an industry buyer which believes it can. On the mid-cap index, data centre group Telecity failed to find favour with investors and analysts following the release of its third-quarter market update. Despite reporting "robust" trading and confirming that the company expects to meet expectations for the full-year, brokers expressed concern about the group's debt position as Telecity announced a €28m (£22.4m) acquisition of Finnish data centre company Academica. Liberum Capital cut its 2013 earnings-per-share forecast by 6pc to 37.2p, pointing to an increase in net debt as a result of higher capital expenditure. The broker, which recommended clients "sell" the shares, estimated that including the Academica purchase, net debt at the year-end will rise to £230m from £200m. Investec analyst James Goodman was of the opinion that the €28m price-tag attached to Academica "seems very expensive." Telecity ended the day down 78 - or 8.5pc - at 835p, the heaviest faller on the FTSE 250, which lost 90.37 points to 12,030.46. Elsewhere, problems at nickel producer Talvivaara's recovery plant in eastern Finland saw the shares slide 5.7 to 129.7p. The company has suspended operations at the site until Wednesday following the discovery of a waste water leak at the weekend. Among the smaller companies, Severfield-Rowen tumbled an eye-watering 34½ - or almost 25pc - to 106¾p after giving guidance for full-year pre-tax profits of about £1m. That compares with £6.8m last year. Cancer drug group Sareum, however, was in demand and jumped 0.2 - 14pc - to 1.625p. Dealers said there was market speculation the company may be about to release some good news, such as the announcement of a new commercial partner. Centamin climbs on Egypt mine hopes Centamin was on the receiving end of some enthusiastic buying after the gold miner gave a bullish update on the situation in Egypt. Shares in the group tumbled 35pc and were eventually suspended last week on reports an Egyptian court had ruled Centamin's contract to mine at the Sukari project, its principal asset, was invalid. Today, the group claimed that although the court's written judgement said there was insufficient evidence the company had ministerial approval for its Sukari exploitation lease, it did indeed possess the relevant documents. Centamin added that it was confident it would resolve the situation through an appeal. The shares jumped 14.05 to 74.55p as a result, but remain well below the 98.8p they were valued at before news of the ruling saw investors flee the stock.