Your comment about three-line whips and party expulsions is untrue. Whilst hypothetically the front bench of any party could withdraw the whip, i.e. expel, any MP, rebellions occur frequently, and unless a party is willing to brave the political consequences (in terms of loss of support in the House and in the country), it is highly unlikely that it would take such a drastic step. My friend David Nuttall MP, for instance, is currently ranked as the most rebellious MP in the current Parliament, and yet he retains the Conservative whip. Generally removal of the whip occurs only in cases of severe misconduct.
There is, on the other hand, the expectation that what's called the 'payroll vote' - members of the government plus those occupying various other positions, such as Parliamentary Private Secretaries - will vote with the whips because of the principle of collective responsibility, and any failure to do so will normally result in the loss of that job and a return to the backbenches. Furthermore, it may be possible for the government to arrange for the de-selection of a sitting MP, rendering them ineligible to stand as a representative of their party at the following general election. In practice this is a far more potent weapon than removal of the party whip, particularly in constituencies with large majorities, and it's the reason why many of us favour the universal adoption of US-style open primaries, in order to render MPs beholden for their political careers to their constituents rather than the party whips.
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