SILVERSTONE, England - Lewis Hamilton fears his Formula 1 title hopes could disappear unless McLaren can pick up the pace after a disappointing showing at its 2012 home British F1 GP on Sunday.The 2008 World champion finished eighth, team mate and 2009 champion Jenson Button 10th - but after starting 18th.Hamilton told the BBC: "We're still in the fight, but unless we find something it's going to be hard to stay in the fight. I raced my heart out, as always, but we just struggled; we did not have enough speed."NO 2008 REPEATHamilton, who won at Silverstone in 2008, led the race briefly in the early stages before a pit stop. He was never able to get back into contention in a GP won by Australian Mark Webber for Red Bull.Image Gallery!"I was expecting us to get at least fifth, but those teams in front of us were much quicker," added Hamilton, fourth in the championship on 92 points. Spaniard Fernando Alonso, second on Sunday, leads the standings on 129."We will keep our heads down, stay focused and at some stage, I hope, we will get a car to challenge at the front."McLaren has slipped from second to fourth in the Constructors' championship, behind Red Bull, Ferrari and Lotus.The next 2012 GP will be in Germany on July 22, the Hungarian race a week later.