On coming of age, Lord Frederick was returned for the county on the family interest. He was expected to support administration. No votes of his are known in his first two Parliaments and no speeches can with any certainty be attributed to him. On 12 Mar. 1798 he wrote to Pitt asking him, if it was his intention to abolish the post of collector outwards of the port of London, to compensate the Duke of Manchester and himself, who had the reversion of it, as it was worth over £2,200 a year, plus patronage.
Montagu’s health was not good (he suffered from a lung complaint); in 1803 he gave up his military career and in 1806 his seat in Parliament.
When he was returned for the county again in 1818, he was dragged from retirement at the pressing request of Liverpool’s ministry to preserve the county in their interest against a strong threat from the Whigs, who apparently objected less to him than to his colleague Fellowes.
