In 1661 he was re-elected MP for Weymouth and Melcombe Regis in the Cavalier Parliament and proved to be a very active member.
In 1661 he was re-elected MP for Bishop's Castle for the Cavalier Parliament.
In 1665, he was elected Member of Parliament for Bere Alston in the Cavalier Parliament although through the tardiness of the Sheriff he did not take his seat until nearly a year later.
In 1660 Allestry was elected Member of Parliament for Derby and was re-elected without contest in 1661 for the Cavalier Parliament.
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It can also mean the reduction or removal of force behind a statute or legislation, for example, "the Triennial Act was emasculated by the Cavalier Parliament".