and launch a bid for the South Pole from there. Scott claimed, in the first of a series of letters to Shackleton, that the area around McMurdo was his own "field of work" to which he had prior rights until he chose to give them up, and that Shackleton should therefore work from an entirely different area. In this, he was strongly supported by Discoverys former zoologist, Edward Wilson, who asserted that Scott's rights extended to the entire Ross Sea sector. Shackleton refused to concede. According to a letter written to Stanfords bookshop owner Edward Stanford, Scott seemed to take offence with a map that was published that had shown how far south Scott and Shackleton had travelled during the Discovery Expedition. Scott implied in this letter, dated in 1907 and discovered in the shop archives in 2018, that having the two men's names together on this map indicated that there was "dual leadership" between Scott and Shackleton which was "not in accordance with fact." After the owner replied with an apology over the issue, Scott expressed his regret at the nature of the previous letter and stated, "I tried to be impartial in giving credit to my companions who one and all laboured honestly and well as I have endeavoured to record....I understand now of course that you had no personal knowledge of the wording and I must express regret that I failed to realise your identity when I first wrote." Finally, to end the impasse, Shackleton agreed, in a letter to Scott dated 17 May 1907, to work to the east of the 170°W meridian and therefore to avoid all the familiar Discovery ground. In the end it was a promise that he was unable to keep after his search for alternative landing grounds proved fruitless. With his only other option being to return home, he set up his headquarters at Cape Royds, close to the old Discovery base. For this he was roundly condemned by the British polar establishment at the time. Among modern polar writers, Ranulph Fiennes regards Shackleton's actions as a technical breach of honour, but adds: "My personal belief is that Shackleton was basically honest but circumstances forced his McMurdo landing, much to his distress." The polar historian Beau Riffenburgh states that the promise to Scott "should never ethically have been demanded," and compares Scott's intransigence on this matter unfavourably with the generous attitudes