Think this us well-argued: http://www.bbc.co.uk/sport/formula1/49629863. Jolyon's a much better columnist than driver

I disagree. Ignoring who the writer is, his point isn't very well argued. The black and white flag was used correctly in the circumstance. In fact it should be used much more than it has been.

So should Verstappen be punished at Austria. And Vettel shouldn't at Canada. Finally once Ferrari is the one doing and not the victim. A well earned break.

Think this us well-argued: http://www.bbc.co.uk/sport/formula1/49629863. Jolyon's a much better columnist than driver

Leclerc moved to the right while he was braking and forced Hamilton off the road. Hamilton couldn't do anything about it, other than to crash with Leclerc or to go off and cut the corner, as he was already on the limit of the brakes and couldn't back out from alongside the Ferrari man. Nor should he have had to.

Last year, Red Bull's Max Verstappen was penalised five seconds for an almost identical infringement on Mercedes' Valtteri Bottas at turn one in Monza, and it cost the Dutchman a podium.

He said the revival of the black-and-white warning flag was a new measure brought in at the request of the teams and drivers to allow for harder racing.

But what precedent does this now set?

It means drivers are potentially allowed to commit one offence in a race and get away with it. What sort of racing is that going to produce? And how is that ethical or fair?

In isolation I probably could see this being allowed, as the curved nature of the 'straight' blurs the lines somewhat. But with the backdrop of the black-and-white flag already deployed, this was potentially a second offence that could have seen a red.

Is there a definition in the rules on how close the following car has to be for a car changing lanes to be considered blocking, rather than for instance just breaking the slipstream?

Overtaking, according to the circumstances, may be carried out on either the right or the left.

A driver may not deliberately leave the track without justifiable reason.

More than one change of direction to defend a position is not permitted.

Any driver moving back towards the racing line, having earlier defended his position offline, should leave at least one car width between his own car and the edge of the track on the approach to the corner.

However, manoeuvres liable to hinder other drivers, such as deliberate crowding of a car beyond the edge of the track or any other abnormal change of direction, are strictly prohibited. Any driver who appears guilty of any of the above offences will be reported to the Stewards.

Drivers must use the track at all times. For the avoidance of doubt, the white lines defining the track edges are considered to be part of the track but the kerbs are not.

What is the natural follow-up to a black and white flag? It used to be a black flag, but that was before time penalties.

This flag should be shown once only and is a warning to the driver concerned that he has been reported for unsportsmanlike behaviour. These last three flags (in d, e and f) should be shown motionless and accompanied by a black board with a white number which should be shown to the driver whose car’s number is displayed.

The flag and number may be combined on a single board. These flags may also be displayed at places other than the start line should the Clerk of the Course deem this necessary.

Normally, the decision to show the last two flags (in e and f) rests with the Clerk of the Course; however, it may be taken by the Stewards, provided that this is stipulated in the supplementary or championship regulations. The team concerned will immediately be informed of the decision.

I dont even know why they allow the driver ahead to move back towards the racing line at all.

If I wrote the rule it would be "make one move to defend you position (though If the car attacking you is already alongside this is prohibited), then no further deviation from this position is legal. Choose your line and stick to it"

Allowing someone to defend to the inside then come back to try and take the racing line is allowing them to have their cake and eat it and is basically allowing 2 blocks while not wording it that way.

We live sad lives and don't have much else to talk about.

You seriously want to end up with horse shit like this???? Good God, if F1 doesn't have enough problems.