The British-based Formula One team fear British legislation enforcing a European Union (EU) directive against tobacco advertising could leave them open to prosecution if they run with cigarette branding in Budapest.
"We have asked the British government numerous times through (team owners) British American Tobacco for clarification," BAR team principal Nick Fry said at the German Grand Prix last weekend.
"We're somewhat frustrated that we haven't had a clear answer on this. We need something in writing, something firm.
"There has been an ongoing request for clarification that has been going on for six months now but we are none the wiser."
The new law enforces an EU directive which outlaws all print advertising, radio advertising and event sponsorship by tobacco companies from July 31.
Legislation in Britain could allow for prosecution of any British-based team if images of a race where tobacco sponsorship is carried are broadcast in the country, even if that race is outside the EU.
BAR, Renault and Jordan are all British-based with tobacco sponsorship.
"There was a positive indication in a question in the House (of Commons) but that is not nearly enough for what could be a criminal act," said Fry.
"We haven't had anything firm yet and for it to be less than a week away now is frustrating to say the least."
A spokeswoman for the British Department of Health said she expected government advice would be issued this week.
Five teams currently carry tobacco sponsorship including Italy-based Ferrari and McLaren, who are expected to end their nine-year relationship with West cigarettes this week.
Renault team principal Flavio Briatore, whose team are sponsored by Japan Tobacco's Mild Seven brand, said he was also waiting for clarification.
