[5] In preparation for bus deregulation, in September 1984, Eastern Counties' operations in Cambridgeshire were transferred to a separate company named Cambus Limited.

[8][9] An Eastern Counties Bristol VRT double decker bus made international headlines when it fell rear-first into a 26 feet (7.9 m) sinkhole formed from a medieval chalk mine running underneath Earlham Road in Norwich on 3 March 1988.

A photograph of the incident would be used by Cadbury the next day in full-page newspaper advertisements and on billboards to promote their Double Decker chocolate bar, captioned with the slogan "Nothing fills a hole like a Double-Decker".

[12][better source needed] In July 1994, Eastern Counties was sold to the GRT Group for £6.7 million,[13][14] who in June 1995 merged with Badgerline to form FirstBus.

[19] On 22 March 2017, First announced that they were to introduce a direct bus service numbered X41, running between Norwich and Bungay in Suffolk via Ditchingham, as part of the Charcoal colour line.

On 2nd October 2024, it was announced that Konectbus would not have their contract renewed for the 2025–2030 period, ending almost 20 years of Norwich park and ride services by the operator.

The Lowestoft services operate out of Britain's most easterly bus depot, situated on Gordon Road, just a few hundred meters away from Ness Point.

The Ipswich services operate out of one depot situated on Star Lane, just a few minutes walk from the town's bus station in the Old Cattle Market.

This service was the first commercially-run guided bus system to be operated in the United Kingdom,[28][29] and would eventually be upgraded to use double-decker buses under FirstBus.

This service is operated by nineteen Alexander Dennis Enviro400 City bodied Scania N250UDs that were delivered in early 2020, which are painted in a red livery and featuring high-specification interiors, next stop announcements and camera mirrors.

[35] The X11 operates as a variation of the X1, shadowing the route of the X1 between Norwich and Gorleston-on-Sea via Great Yarmouth, before diverging at James Paget University Hospital to serve and terminate in Belton rather than continuing onwards to Lowestoft.