The UCI has not yet responded to a request for comment, but a Home Office spokesperson said: “We do not routinely comment on individual cases. All visa applications are carefully considered on their individual merits in line with the immigration rules,” adding: “We have been working closely with organisers to ensure that participants of this event are clear on the visa application process and timelines.”
Give them Visas on arrival. They sure will cycle/arrive early. That is if they need visas.