Without any clear explanation about promoting Yamamoto to the HRT race seat for Silverstone these extracts, from a piece on jamesallenonf1.com, offer two possible explanations. The first is that Senna is being disciplined for some reason, the second could be a deal linked to aquisition of assets from the former Toyota F1 team. It's well known that HRT has ended the deal with Dallara and will need to develop a chassis themselves for next year, so why start that process with the 2010 Toyota as a base.
It appears not necessarily to be a money issue, although Yamamoto believed to have $5 million budget and the team needing money. I understand that there may be a disciplinary angle to this. A statement went out from the team this afternoon which said nothing about the reasons for the switch beyond them wanting to give one of the other drivers a go.
Senna’s deal with the team dates back to before the season, when the team was called Campos. It was based on the team being able to use the Senna name to attract sponsors. Senna and his family were not wanting to be obliged to provide budget for the drive.
Meanwhile it appears that the team may have acquired some of the assets of the Toyota team in Cologne. Serbian F1 aspirants Stefan GP had announced their intention to buy the Toyota chassis before the season, while more recently ART GP looked at buying the cars for a potential entry next season as the 13th team.
ART have officially withdrawn now from the race for the 13th franchise, citing unfavourable economic conditions.
Jamesallenonf1.com, July 9.