"Constant tinkering" with the system leaves no time for teachers to get to grips with the changes and is costly at a time when education budgets are being cut, he said.

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There was no commitment to introduce the boundary changes in time for the 2015 election, Mr Clegg argued, and the Lib Dems as a whole would not support their introduction before then in any future vote.

BBC: UK Politics

But there will be no changes before the end of the season this time, despite his announced replacement Middleton already being at the club.

BBC: Paul Hull plays down need for early changes at Bristol

There are no radical changes, although there may be some changes over time.

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It has also said there will be no change to pay levels over the next five years - during which time the proposed changes would be implemented.

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Indeed the opposite tendency is sometimes evidence: when society or the economy changes, ways of acting that used to work most of the time now may no longer work at all.

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You all signed on knowing this was a young company, and while no one likes a fire drill, at the same time you have to get used to changes and moving fast if you want to be a Patch editor.

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"NO changes the properties of other parts of the brain's neural network at all kinds of different time scales, " he said.

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Russell Hobby of the National Association of Head Teachers said there had been no time to see how pupil premium funding was working, so it was too early to start planning for further changes.

BBC: Primary schools face tougher targets