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In 2025, she signed a pro contract with {{UCI team code|LAJ}} to join their development team in 2026 ahead of a move to the elite squad in 2027. In February 2026, Boothman placed third overall in the individual pursuit at the British Track Cycling Championships.[{{cite web|website=Cycling Weekly|url= https://www.cyclingweekly.com/racing/im-just-over-the-moon-world-record-holder-josie-knight-wins-nail-biting-individual-pursuit-final-at-british-track-championships|accessdate=21 Feb 2026|title= 'I'm just over the moon' – World record holder Josie Knight wins nail-biting individual pursuit final at British Track Championships|first=Tom|last=Davidson|date=21 Feb 2026}}] Later at the championships, she won the elimination race, finishing ahead of [[Anna Morris]] and [[Katie Archibald]].[{{cite web|website=Cycling Weekly|url=https://www.cyclingweekly.com/racing/it-means-the-world-teenager-erin-boothman-pulls-off-shock-victory-against-olympians-at-british-track-championships |accessdate=22 Feb 2026|title= 'It means the world' – Teenager Erin Boothman pulls off shock victory against Olympians at British Track Championships |first=Tom|last=Davidson|date=22 Feb 2026}}] |
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In 2025, she signed a pro contract with {{UCI team code|LAJ}} to join their development team in 2026 ahead of a move to the elite squad in 2027. In February 2026, Boothman placed third overall in the individual pursuit at the British Track Cycling Championships.[{{cite web|website=Cycling Weekly|url= https://www.cyclingweekly.com/racing/im-just-over-the-moon-world-record-holder-josie-knight-wins-nail-biting-individual-pursuit-final-at-british-track-championships|accessdate=21 Feb 2026|title= 'I'm just over the moon' – World record holder Josie Knight wins nail-biting individual pursuit final at British Track Championships|first=Tom|last=Davidson|date=21 Feb 2026}}] Later at the championships, she won the elimination race, finishing ahead of [[Anna Morris]] and [[Katie Archibald]].[{{cite web|website=Cycling Weekly|url=https://www.cyclingweekly.com/racing/it-means-the-world-teenager-erin-boothman-pulls-off-shock-victory-against-olympians-at-british-track-championships |accessdate=22 Feb 2026|title= 'It means the world' – Teenager Erin Boothman pulls off shock victory against Olympians at British Track Championships |first=Tom|last=Davidson|date=22 Feb 2026}}] At the 2026 [[UCI Track Cycling World Cup|Track Cycling World Cup]], Boothman won a silver medal in the team pursuit, before winning another silver in the madison with [[Maddie Leech]].[{{cite news |title=Richardson and Finucane win Track World Cup golds |url=https://www.bbc.co.uk/sport/cycling/articles/c937481dzjlo |access-date=19 April 2026 |work=BBC Sport |date=19 April 2026 |archive-url=https://web.archive.org/web/20260419133525/https://www.bbc.co.uk/sport/cycling/articles/c937481dzjlo |archive-date=19 April 2026 |url-status=live}}] |