Jun.25 (GMM) The struggling team Force India will unveil a substantial car upgrade during the pre-British grand prix test at Silverstone this week.

Giancarlo Fisichella and Adrian Sutil are yet to break out of the lowly 'Q1' qualifying segment so far in 2008, as they drive what is essentially the Spyker single seater of last year.

"Where we are now really is a sign of the previous years' lack of investment," technical boss Mike Gascoyne told the Indian publication DNA.

At Silverstone - located just across the road from the team's Northamptonshire base - this week, Force India is testing new bodywork, sidepods, diffuser, front wing, inverter damper and 'shark fin' engine cover.