The group's later acquisition of Southampton Citybus and Southern National saw the companies combined to form First Hampshire & Dorset, which provides the majority of services in the city today.
It acquired competitors in Plymouth (Traveller Coaches) and Portsmouth (Olympic Services), and made co-ordination agreements with Southdown and East Kent (between Margate and Bournemouth), Greyhound Motors (between London and Bristol), Western National (between London and Plymouth) and Southern National (between London and Paignton).
Camelford railway station served not only Camelford, but also Tintagel and Boscastle (which did not have a closer rail link) with bus services operated by Southern National connecting the villages with the station.
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Mersereau was President of the Southern National Academy of Design until 1933 when succeeded by Nan Sheets, and a member of the Society of American Artists.
Later that year, Southern National announced the $5.6 million purchase of First Palmetto Bancshares Corp. of Columbia and the $9.75 million purchase of Capital Bank and Trust Co. of Belton.
In May 1989, Southern National announced its purchase of Allied Bankshares Inc. of Thomson, Georgia.