While motorsports fans continue to blast TEN over moving Formula One from ONE to TEN, now sponsors are speaking out on the switcheroo.

The Australian reports that Mark Behr, executive manager of marketing for Shannon’s Car Insurance said, “We have already passed on the concerns expressed by some enthusiasts directly to Channel TEN and will continue to review the situation, as we do with any sponsorship.”

Multivitamins company Swisse said it contacted TEN after receiving a call from the newspaper.

“We have been informed that it is only live on the east coast at this stage but that the network is looking at all options,” a spokesperson said.

The switch, which also reverses a promise of HD coverage, triggered a backlash on social media.

As of last night there were 847 signatures on a petition being hosted at BoycottTENSport.com

TEN has reportedly justified the decision as being a commercial move.

Last week a spokesperson simply told TV Tonight, “As of this Sunday, April 22, Formula One will be broadcast on TEN at 9.30pm. This allows all Australians to access the Formula One coverage in a consistent time slot every Sunday night.”

On the weekend Sebastian Vettel held off Kimi Raikkonen to win an incident-free Grand Prix in Bahrain, following anti-government protests that turned violent in the days before the event.

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