The optical illusion is caused by a regular rainbow and a sunset happening at the same time.
Rare 'pink rainbow' spotted in sky over Bristol
A rare pink rainbow was spotted in the sky over Bristol, England
Pink rainbows light up the sky over England
Bristol skyline sees a rare flat rainbow after heavy rain
Rainbow over bristol hi-res stock photography and images - Alamy
Rare and beautiful 'rainbow' clouds spotted in skies over Warwickshire
Un arc-en-ciel rose bonbon très rare illumine le ciel en Angleterre
Pink rainbows spotted over south and west of England - BBC News
Rare pink rainbow spotted in the skies over Devon - Devon Live
Spectacular 'pink rainbow' spotted over west of England
Stunning pink rainbow spotted in the skies over Bristol and beyond - Bristol Live
Stunning 'rainbow clouds' spotted over the North East - Chronicle Live