British Dual Nationals Denied UK Boarding - Firsthand Accounts for The Guardian

The Guardian is investigating the impact of new Home Office border control rules requiring British dual nationals to have a British passport or a certificate of entitlement to board flights, ferries, or trains to the UK. They are seeking firsthand accounts from British dual nationals who have been prevented from travelling due to not having the required documentation. We would like to hear from British dual nationals who have been prevented from boarding a flight, ferry or train because they did not have a British passport or certificate of entitlement. Have you been denied boarding a flight, ferry or train to the UK because you are a British dual national without the required proof? Please include as much detail as possible.