Montagu succeeded his brother as Member for Huntingdonshire under a compact between their father and Lord Sandwich ‘to agree to a reciprocal nomination during the present Parliament’.
Before the general election of 1774 Lord North wrote to Lord Dartmouth, on 2 Oct.:
I have just heard that Lord Charles Montagu, upon the recommendation of the Duke of Cumberland, is going to offer himself a candidate for Southampton in opposition to Mr. Stanley and Mr. Fleming. I take it for granted that he either is not apprized that those two gentlemen have the wishes of Government, or that he has not sufficiently considered how improper it is for a person in his situation to embark in any measure of opposition.
North therefore asked Dartmouth to try to dissuade him.
As to his Royal Highness [North went on to say], it would be presumptuous in me to give, or even to form any opinion upon the part which may be the most proper for him to act with respect to Southampton, but I own I shall be much concerned to hear that he has determined to take any step, which may possibly give offence, and which can not be of any advantage either to himself or to the person whom he honours with his protection, for I am informed from good authority that Lord Charles has no chance of success.
Montagu replied from Southampton on 3 Oct.; expressed his concern that the part he was taking should be objectionable to Dartmouth; and concluded:
Thus situated, your Lordship will ... see the necessity of my persevering, nor think because I refuse to yield my pretensions to Mr. Fleming (with whom your Lordship will allow me to observe that I have at least an equal title to the favour of Government) I therefore mean to give into a wanton opposition to the King’s ministers.
Four days later, he was badly defeated, but when (wrongly) informed that Fleming had vacated his seat by accepting office, Montagu set out for Southampton to renew his canvass—‘I must add’, wrote Manchester to Dartmouth, 31 Oct. 1774, ‘that my brother, from his connexions and living a good deal at Southampton, has formed no contemptible interest of his own, which might induce him to do more than I wish.’
After this little is heard of him till, presumably in consequence of the reconciliation between the Duke of Cumberland and the King, Manchester wrote to Dartmouth, on 26 June 1780, complaining that a man of his brother’s rank, capable and willing to serve his country, should be totally refused and forced to seek refuge in another.
