In-laws Mark Blythen and Margo Oakley are competing in the final of Race Across the World12:11, 21 May 2026A pair of Race Across the World stars have made an admission ahead of the 2026 final.‌The hit travel competition sees five intrepid teams embark on the journey of a lifetime, spanning more than 12,000km across southern Europe and Central Asia. They have navigated several checkpoints on their way to Hatgal in remote northern Mongolia.‌Last week, the remaining four teams - Jo and Kush, Mark and Margo, Andrew and Molly, and Katie and Harrison - entered Mongolia for the penultimate leg.‌In-laws Mark and Margo faced a crushing setback as their budget continued to dwindle. At the end of the leg, it was revealed that Jo and Kush had maintained their lead. They were followed by Molly and Andrew, and Katie and Harrison. Meanwhile, the in-laws were still 470km away.Ahead of the anticipated final airing tonight (Thursday, May 21), Mark and Margo appeared on ITV's Good Morning Britain, where they spoke to hosts Richard Madeley and Susanna Reid about their previously fractious relationship. The duo have openly talked about "not really getting on" for 40 years, prior to appearing on the BBC competition.‌On GMB, Richard began: "They clashed right from the off. She found him judgey, he saw her as loud and wild."Susanna then said: "I would never of believed that you didn't get on and the link between you, Julia, even though I'm sure she wanted you to be close friends, actually you weren't."Mark said that he built a friendship with Margo as they both cared for Julia - Margo's sister, who was married to Mark. Julia sadly died from a rare form of cancer in 2022.‌"She wanted us to be friends, she wanted us to built on what we'd actually got in caring for her, and taking it further," Mark explained.Richard shared: "It's funny how you can really take against somebody on site. For some odd reason, there's something about that person that gets up your nose."Mark then admitted: "I was judgey and boring," with Margo adding: "Mark would judge people, but you have changed since then." The stars also shared that they didn't have rows, but were quite cold with each other.‌Speaking about their relationship ahead of the final leg, Mark said: "I think the adversities of leg seven, and being able to overcome those together, has been quite a big turning point in our friendship."We worked really hard together and when we were low, Margo had some extra energy and joy to raise us up and force us to continue to the checkpoint. It was tough but our friendship has strengthened and we are determined to keep going to that finish line."Article continues belowTo finish the race, the final four teams must head north from Kharkhorin to reach the shores of the "Blue Pearl of Mongolia", Lake Khövsgöl.As they leave the checkpoint, they will face a crucial decision. They could head directly north, a shorter route but one which requires them to go-off road, or add 500km to their journey with a detour via the capital, Ulaanbaatar. Who will reach the finish line first? We'll have to wait and see.Race Across the World concludes tonight (Thursday, May 21) at 8pm on BBC One and BBC iPlayer