L1/Heathrow Buses HN on Twitter: "Extras will run on Routes: N4 X91 392 311 456 117 237 338 65/N65 85 213 290 N117 335 205 9H and some buses will run London United routes."
TfL's newest bus route – BusAndTrainUser – journeys around Britain by bus and train
News from Joanne McCartney: Joanne welcomes TfL's decision to improve hospital transport links | London City Hall
Sita bus #125 BS00BP on route 456 at Sunshine station - Wongm's Rail Gallery
London Buses route W10 | Bus Routes in London Wiki | Fandom
Enfield Dispatch | Councillors turn down chance to review new bus route
London Bus Updates | Homepage
The South London Bus Blog: New Route 456 Proposal
456 Bus Route through Winchmore Hill – update January 2021 with Winchmore Hill Residents Association