What's corroborated

The penultimate leg of the BBC series saw teams travel from Ugll to Kharkhorin in Mongolia.

Mark and Margo were still 470 km away from the checkpoint at the end of the leg.

The teams are Jo and Kush, Mark and Margo, Andrew and Molly, and Katie and Harrison.

Mark and Margo faced budget troubles and decided to focus on their budget rather than racing.

Mark and Margo stayed with a family of teachers on the outskirts of Myangad and sampled suutei tsai.

Race leaders Jo and Kush set off first and pushed north to reach a homestay near the highway.

The competitors encountered inaccurate international maps of Mongolia and had to rely on locals.

Race Across the World is available to stream on BBC iPlayer.

Viewers reacted emotionally on social media, with some describing the moment as tearful.

Andrew fought back tears while speaking about his experience in Mongolia.

Andrew said the heart attack knocked his confidence and caused stress and anxiety.

Andrew collected cow dung for fuel in an old wheelbarrow during the episode.

Junior doctor Molly, 23, shared a story about her father Andrew, 54, having a heart attack three years ago.

Contestants relied on paying strangers for car shares to reach the seventh checkpoint.

The leg covered 1,550km in freezing conditions and off-road travel.

Race Across The World viewers were left in tears after a contestant's health setback was revealed.

Margo stated that teams get along at checkpoints despite competitiveness.

Margo mentioned that she, Molly, and Katie may have had wine together.

Margo noted that Mark and Andrew would discuss rocks, bridges, or history.

Margo felt Harrison looked 'slightly concerned' by her energy and chaos.

Margo praised co-stars Jo and Kush, calling Kush 'a thoughtful, emotionally open young man'.

Margo shared details on Facebook about her time on the show.

The show's route was 2,000km from Palermo, Sicily, to Lake Khövsgöl in northern Mongolia.

Margo appeared on BBC's Race Across the World alongside her brother-in-law, Mark.

Margo Oakley is a 59-year-old hypnotherapist from Liverpool.