Source: p 127, Is Eating People Wrong? Great Legal Cases and How They Shaped the World (2011) by Allan C. Hutchinson
Undaunted, Leechman made the final maneuver available to May – he applied for leave to appeal to the Judicial Committee of the House of Lords, the highest court of appeal for all cases in the United Kingdom, including Scottish cases. Her petition to appeal in forma pauperis was presented on February 26, 1931, and granted on March 17, 1931. All was now set for the final showdown in which there was much more at stake than the commercial relations between gingerbeer manufacturers and their clients.
[Glaswegian Solicitor Walter] Leechman, but not May, traveled down to London to listen to arguments in December 1931. As was and remains the custom, local lawyers brief more senior counsel on such occasions. May was represented by George Morton (king’s counsel) and W[illiam] R. Milligan, who was later to become Scotland’s lord advocate.
The source above, Wikipedia and MRS. DONOGHUE’s JOURNEY1 by Martin R. Taylor QC all state that Solicitor Walter Leechman (altruistically, benevolently) acted freely to represent May Donoghue; but they do not clarify whether the two barristers (bolded above) were paid or pro bono?
1Originally published in Donoghue v Stevenson and the Modern Law of Negligence, Continuing Legal Education Society of British Columbia, 1991