FTSE - a word of warning

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A word of warning yesterday trading the FTSE +5 I believe the market was more than 5 pts higher at the end of a trade but not according to Betfair - they get their data feed from Tenfore part of Morningstar -four separate independent sources have told me that the market was some three points higher than this quote - which makes quite a difference! Betfair may be right but why would four others be wrong? Betfair will only settle on this source - quite rightly - but it should be a source we have faith in.