Sidney was heir to Penshurst Place, which had been in the family since the reign of Edward IV. Through his father, the second son of Sir Bysshe Shelley of Castle Goring, Sussex (his first with his second wife Elizabeth Perry), he had a claim to the ancient barony of Lisle, formerly vested in the Sidneys and Dudleys, and he was coheir to the baronetcies of Berkeley and Tyes.
Sidney, who is not known to have spoken in debate, voted against the Jewish emancipation bill, 17 May 1830. Clarence, on becoming William IV, appointed him one of his equerries with his other sons-in-law, and he retained his seat for Eye at the ensuing general election.
expressed himself most pleased with the handsome manner in which you met and acted upon the communication ... and approves of your accepting the Chiltern Hundreds. He gives you credit for the sacrifices you are making and full credit also for the correct and honourable principles which has produced that sacrifice as he is the last man who would wish or expect anyone to give a vote he could not reconcile to his conscience.
William IV-Grey Corresp. i. 89, 136-50, 195; de L’Isle mss C240/1.
By 8 Mar. Sidney was out of the House. It was common knowledge that ‘his sentiments were not in favour of the reform bill’, but ‘he found it impossible to vote against the measure’.
Sidney, who with Kerrison was awarded the Grand Cross of the Guelphic Order of Hanover, 24 Mar., did not stand for Parliament again, but he appears to have assisted William Robert Keith Douglas* and other anti-reformers at the 1831 general election.
If ever I have the good fortune to go into the House of Lords, I must enter it with the same feelings that actuate me here ... It is indeed a time when we must be true to ourselves and repel firmly the base and scandalous attacks that are daily levelled by the public prints at the aristocracy ... who have, I think, therefore proved themselves worthy of the land they live in.
Add. 37069, f. 296.
As the constitutional crisis over the reform bill deepened early in 1832, he argued against packing the Lords; and, in a bid to prevent it, he tried, with Sophia and Lord Strangford, to persuade Wellington to issue ‘a declaration or resolution for moderate reform’, and reassured him that the ‘king was wavering and anxious to embrace a modified measure’.
