In the Telegraph Aggreko gets the once over from Questor. There's no doubt it's a successful company, providing temporary power to everything from the Olympics to Glastonbury. Yesterday it announced a 250m-dollar contract to build a temporary power station serving both South Africa and Mozambique. But it trades at 20 times earnings and only yields 1.1 per cent. Too high for now. Questor suggests a hold.For Tempus in the Times, defence contractor Chemring is not a buy. It trades on just six times earnings and yields 6% so the maths look good but, short of a takeover bid, Tempus doesn't believe the shares are going anywhere and the sale of its marine flares brand, Pains Wessex, looks like a bad decision. Leave.Some more positive news for Nautical Petroleum. It announced a new discovery in the North Sea yesterday and ought to benefit from tax changes on oil exploration and development. With some brokers thinking it could be worth double its current 269p, Tempus says buy if you like North Sea stocks.Please note: Digital Look provides a round-up of news, tips and information that is impacting share prices and the market. Digital Look cannot take any responsibility for information provided by third parties. This is for your general information only as not intended to be relied upon by users in making an investment decision or any other decision. Please obtain a copy of the relevant publication and carry out your own research before considering acting on any of this information.BS