The advertising agency WPP has been asked to work up ideas for a government-endorsed advertising blitz to urge more consumers to invest in stocks through a “Tell Sid”-style campaign expected to cost tens of millions of pounds. It comes as the London Stock Exchange continues to lose stock market listings and floats to foreign rivals. Decades earlier, the US launched the “Own your share of American business” investment campaign. WPP has been approached about potentially working up some ideas for the new share-buying campaign, industry sources told the Guardian. The WPP agency Ogilvy works with Lloyds Banking Group, while VML handles the HSBC account and NatWest is with The & Partnership.