Jenson Button is not ready to throw in the towel on this season - despite it being the most frustrating of his career.

Button concedes a disastrous start to 2007 is far from the worst time he has endured during his seven years in Formula One.

That 'accolade' belongs to a pitiful 2001 when he claimed a mere two points from 17 races for Benetton, with a woeful car retiring six times.

Button, however, will struggle to better even that paltry total if Honda do not quickly provide him with a competitive car, starting with this weekend's Spanish Grand Prix at the Circuit de Catalunya

Improvements have been made since the previous grand prix in Bahrain, in particular with regard to the aerodynamics package.

Team-mate Rubens Barrichello disparagingly claimed recently that the car ''acted like a parachute'' down the straights, effectively dragging it back down the field .

There have been suggestions Honda should concentrate on building next year's car, and consign this season to the dustbin.

But despite the problems, Button said: ''Without doubt this is the most frustrating period of my career because I know I am good enough to win the world championship.

''It's tough when you don't have a car to do that, but I'm pretty confident, as are the team, in my ability. But it's just more annoying than anything else because I know we can do a lot better than we have.''