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"But if we feel there is danger before then, we will be asking for those barriers to be put there earlier than that," said Bernard.

"What you are trying to do is buy time with a barrier there to give the players time to get off."

The England and Wales Cricket Board is, meanwhile, backing calls for stiffer penalties for anyone invading the outfield.

"Back at the World Cup in 1999 we explored the idea, with the Home Office, of making it an offence to trespass onto a cricket ground. In the end, it was felt that it was not appropriate at the time.

"Now we feel that the only way of dealing with this problem will be to invoke legislation," said chief executive Tim Lamb.

Stepehen Speight, the steward injured in Sunday's pitch invasion at Headingley, has said in a statement that his head feels like it has been "kicked around a football field".

He suffered a broken nose and badly brusied ribs in the incident, but fellow steward Euan London says Speight failed to follow orders.

"The guy who got injured ignored an instruction that if they came onto the pitch, everyone was to let them have the stumps.

"He was trying to stop them from getting the stumps so the game could carry on, and that's why he got a shoeing," London commented.

England captain Alec Stewart eventually conceded the game as Pakistan were only four runs short of their victory target when the invasion occurred, with 10.1 overs in hand.