If losing votes to UKIP was a threat to just the Tories then why did Miliband feel the need to include the pledges "Reform the EU so it "works for Britain" and "Allow no further transfer of powers to Brussels without a referendum" in his 2015 GE campaign? Had it been just a Tory issue he would have had no need to mention anything about the EU and could have simply hoped Labour would have won by virtue of UKIP eroding the Tory's share of the vote. Why did 52% of Labour consistencies vote to Leave if it was only the Tories losing votes to Eurosceptics? Why did Jeremy Corbyn's Labour continue this trend and pledge to take the UK out of the EU in 2017?
Leaving the EU has never been a simple left or right, Tory or Labour issue.
This option has never been available. The government was bound to carry out Brexit due to the fact that it had promised to fulfil the result of the referendum. If abandoning Brexit was truly an option then why do you think not one of 650 elected MPs have seriously suggested this in the last two years?
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No deal is not an option Parliament will simply not allow it.
It was said many moons ago "Brexit means Brexit" well May's deal or trying for the Norway option is Brexit.