When David Cameron announced plans for the Conservatives to leave the European People's Party he essentially left two ways open for Tory Europhile MEPs to protest. They could either register their objection to the policy before the election and announce they they wouldn't join the new Euro grouping- thus putting their fate into the hands of the electorate. This would be a brave and honourable method of registering their disapproval.
If they aren't brave or honourable then Edward MacMillan Scott's approach is much less risky- you stand on the popular Eurosceptic platform for the the election, but then once you are elected and have your snout in the trough for the next 5 years you announce that you cannot in all principle go along with what you promised to do during the election held less than a month previously and jump ship.
EMS can't even go through the whole "my party left me" stuff that defectors usually engage in because David Cameron quite specifically waited until after the European election to withdraw from the EPP, had he done so beforehand the likes of EMS could legitimately claim that they were staying true to the principles they were elected on.
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