An Oxford College has been warned it could be unlawfully discriminating against Christians after it had previously cancelled a conference booking amid “ill-founded complaints” from students.

Worcester College, led by David Isaac, the former head of the equalities watchdog, apologised for hosting a Christian Concern training camp and cancelled a second booking after students complained they were “distressed” by the event.

But an independent review has found that no evidence for allegations including “aggressive leafleting” by attendees, who were alleged to have approached students to discuss LGBT ‘conversion therapy’.

The inquiry, by lawyer Michael Stewart, found that the college staff were not even able to find a copy of the leaflet.

The Free Speech Union has now written to Mr Isaac calling for him to apologise and to reinstate the booking for the next Wilberforce Academy conference in September.