On 3 December 1942, Crosville became a subsidiary of the Tilling Group, resulting in a change from maroon to Tilling-green livery, and Bristol-chassised buses replacing Leyland as the manufacturer of choice.

Crosville emerged from the war far stronger in many ways, with healthy cash reserves in the bank or accumulating nicely in property assets, unable to replace their fleet at their normal renewal rate.

By the time that the post-war government of Clement Attlee merged both Tilling and the railway companies into the British Transport Commission on 1 January 1948, and Crosville was nationalised, the coach operators were a sustainable competitive entity.

The combination of this, plus the Suez Crisis of 1956 and a lack of staff due to low wages, led to a general contraction of the network of countryside routes and reduced services by at least half on a Sunday.

The network continued to decline, except in the provision of a new service to replace railways removed by the Beeching Axe, with the 1965-introduced "Cymru Coastliner," between Chester and Caernarfon anticipating the closure of that British Rail route and the intermediate stations.

Although they had reduced costs by the introduction of one-man operation, Crosville submitted a list of 196 routes that required financial assistance.

A consolidation of companies within NBC resulted in Crosville taking over services in parts of West Wales from Western Welsh, including those from the depots in New Quay, Newcastle Emlyn and Lampeter.

Rebranding of local services in metropolitan areas assisted in flattening the rate of decline in revenues, but losses continued to mount.

On 13 February 1986, the Secretary of State for Transport decided that, because of their size, the four largest NBC companies would be split, as they provided too great a competitive threat to deregulation.

The latter move was quite a reversal of fortunes, as much of Crosville's territory in the eastern half of Cheshire had been gained from the original North Western company at its dismemberment in 1972.

[13] Following losses, the business was sold with depots in Chester, Rock Ferry and Wrexham to Stagecoach Merseyside & South Lancashire in December 2012.