Barwell came of a family (originally from Kegworth, Leics.) which had East Indian connexions since at least 1682.
Barwell is best known for his support of Warren Hastings in the struggle against Philip Francis and his allies in the Supreme Council, 1774-80, though the alliance did not survive Hastings’s return to England. Barwell was a calculating man, with strong family feelings but few close friends, despite his expansive hospitality; but he also avoided making enemies,
While still in India he had distinguished between
a servant of Government and a creature of the ministers. The former ... a character which uninfluenced by a change in the Administration, invariably adheres to the court, and not ... like the latter, attached to any personal interests of an individual.
Barwell to his sister Mary, 30 Mar. 1776, Bengal Past Present, xiv. 223.
He kept in touch with John Robinson, secretary to the Treasury,
In the House he was one of the richest ‘nabobs’: he was believed to have returned with a fortune of more than £400,000. Though he was only 40 when elected to Parliament, his active career lay behind him. He sought a seat, no doubt partly for prestige, but partly to protect himself against attacks on the sources of his East India wealth. His three recorded interventions in parliamentary debate before 1790 were all in self-defence: 5 Mar. 1782 over his refusal to answer some questions put to him by the secret committee; 28 May, over the Rohilla war; and 19 Apr. 1787 in reply to a reference by Burke to him.
Henceforth he was a consistent, though inert, supporter of Administration; voted with them against the impeachment of his former colleague, Sir Elijah Impey, 9 May 1788; and paired on their side in the divisions on the Regency. Shortly before the general election of 1790 Barwell and Lord Darlington purchased the estate of John Nesbitt at Winchelsea, the borough for which Barwell sat for the rest of his parliamentary life. He also purchased the borough of Tregony from Sir F. Basset.
Barwell found adjustment to English life hard on his return from India, but seems to have overcome his difficulties.
While I was at Uppark a marriage took place near there that surprized most people. Mr. Barwell, the great East Indian of Stansted, to Miss Coffin, a very pretty little girl not 16, of American extraction. Till a fortnight before this event he kept a very beautiful mistress close to his park, by whom he has several children, and till very lately he declared most strongly against matrimony. He seems a good-natured man, but the mogul prevails strongly, I think, in his way of life and conversation.
Barwell died 2 Sept. 1840.
