The FIA could be pressured into more rigid scrutiny of pit-to-car messages after finger-pointing suggested Red Bull contravened the new rules in Singapore.

Ahead of the Singapore GP, F1 moved to forbid radio communications which directly benefit a driver’s performance.

Although opening up potential grey areas, messages relating to reliability and safety can be made without penalty.

The radio debate looks set to escalate after McLaren racing director Eric Boullier accused Red Bull of breaching the new rules over messages relating to Daniel Ricciardo’s battery issues.

Despite a pre-race warning not to do so, Red Bull told Ricciardo that steering clear of the kerbs would help his problems.

“It just made us more busy listening to others to make sure they made no mistakes, like Red Bull twice with Ricciardo,” Boullier said of the new radio rules.

“I think it was coded, but it is up to the FIA to investigate. It is not for me to investigate.

“But it was a strange message. Once was okay, but twice, three times? You can doubt what exactly the car problem was.”

Red Bull team boss Christian Horner disclosed that he had approached race director Charlie Whiting during the race to seek firmer direction on the new radio rules.

“We spoke to Charlie, we told him he’s got some reliability issues and that was why he was told to keep off the kerbs because that was causing damage to the battery for instance,” Horner said.

Ricciardo had experienced problems before the halfway mark in the race when the battery was not discharging before he soldiered on to finish third behind Lewis Hamilton and team-mate Sebastian Vettel.

“There was quite a lot of management that needed to go on to help him with that. It was quite intermittent, the problem we had,” added Horner.

“If there had been a full radio ban it wouldn’t have made life easier, that’s for sure.

“It’s finding that balance with this radio stuff.”