It looks like BP could be trying to cash in on some UK government largesse.The Sunday Times reported yesterday that the oil giant is offering to sell around £2bn worth of assets in the North Sea.The paper claims the sale has been prompted by the Chancellor George Osborne's decision in this year's Budget to underwrite 75% of the decommissioning costs of taking down oil rigs.Potential buyers of North Sea fields have been put off investing because of fears at facing a big bill at the end of a project.At 10:06 BP shares had risen 0.34%. So far this year the stock is 4% ahead.