Recent screen tests in London have elevated Jack Lowden to frontrunner status at 41.9% implied probability, driven by his confirmed inclusion among the final candidates alongside Callum Turner at 26.8%. Lowden’s portrayal of MI5 agent River Cartwright in Slow Horses provides relevant spy-genre experience, reinforced by endorsements from co-star Gary Oldman and industry speculation tying him to a traditional British interpretation of the role. Turner’s momentum reflects his own test participation and rising profile, while Josh O’Connor’s lower 10.8% share stems from more limited corroboration in reports. The 15.5% probability on no selection yet captures ongoing uncertainty ahead of an expected announcement by year-end, as Amazon MGM narrows options from a broader longlist that has already sidelined names like Jacob Elordi.