Answer the question at the end by quoting:

Bowring was born in Exeter of Charles Bowring (1769-1856), a wool merchant whose main market was China, from an old Unitarian family, and Sarah Jane Anne (d. 1828), the daughter of Thomas Lane, vicar of St Ives, Cornwall. His last formal education was at a Unitarian school in Moretonhampstead and he started work in his father's business at age 13. Bowring at one stage wished to become a Unitarian minister. Espousal of Unitarian faith was illegal in Britain until Bowring had turned 21.
By 1847, Bowring had assembled an impressive array of credentials: honorary diplomas from universities in Holland and Italy, fellowships of the Linnaean Society of London and Paris, the Historical Institute of the Scandinavian and Icelandic Societies, the Royal Institute of the Netherlands, the Royal Society of Hungary, the Royal Society of Copenhagen, and of the Frisian and Athenian Societies. Numerous translations and works on foreign languages, politics and economy had been published. His zeal in Parliament and standing as a literary man were well known. In 1849, he was appointed British consul at Canton (today's Guangzhou), and superintendent of trade in China. Arriving on the HMS Medea on 12 April 1849, he took up the post in which he was to remain for four years the next day. His son John Charles had preceded him to China, arriving in Hong Kong in 1842, had been appointed Justice of the Peace and was at one point a partner in Jardines. Bowring was quickly appalled by endemic corruption and frustrated by finding himself powerless in the face of Chinese breaches of the Treaty of Nanking and refusal to receive him at the diplomatic level or permit him to travel to Peking, and by his being subordinate to the Governor of Hong Kong who knew nothing of his difficulties. For almost a year from 1852 to 1853, he acted as Britain's Plenipotentiary and Superintendent of Trade and Governor of Hong Kong in the absence on leave of Sir George Bonham, who he was later to succeed. Bowring was instrumental in the formation in 1855 of the Board of Inspectors established under the Qing Customs House, operated by the British to gather statistics on trade on behalf of the Qing government and, later, as the Chinese Imperial Maritime Customs Service, to collect all customs duties, a vital reform which brought an end to the corruption of government officials and led modernisation of China's international trade. Concerned for the welfare of coolies being exported to Australia, California, Cuba and the West Indies, and disturbed by the coolie revolt in Amoy in May 1852, Bowring tightened enforcement of the Passenger Act so as to improve coolie transportation conditions and ensure their voluntariness.

When did he finish this position?

Answer the question at the end by quoting:

Curved Air are a pioneering English progressive rock group formed in 1970 by musicians from mixed artistic backgrounds, including classical, folk, and electronic sound. The resulting sound of the band was a mixture of progressive rock, folk rock, and fusion with classical elements. Along with High Tide and East of Eden, Curved Air were one of the first rock bands after It's a Beautiful Day and the United States of America to feature a violin. Curved Air released eight studio albums, the first three of which broke the UK Top 20, and had a hit single with "Back Street Luv" (1971) which reached number 4 in the UK Singles Chart.
However, Darryl Way and Sonja Kristina remained interested in working together, and so Way brought in two more "Car Thieves", guitarist Mick Jacques and drummer Stewart Copeland. Though more members of this new lineup came from Stark Naked and the Car Thieves than Curved Air (Kristina being the only member not from the former band), they decided to adopt the Curved Air name for the same reasons that the Kristina/Wedgwood-led band had. With Darryl Way at the helm, this new band often employed the same classical and folk influences as the original band (and even played some of the original band's songs at their shows), but their core sound was rooted in pop, rhythm and blues, and hard rock. Miles Copeland III, still serving as Curved Air's manager, put the group on his own label, BTM. The band kicked off with a European tour, which started poorly. Way, a notorious perfectionist, grew impatient with the struggling of his bandmates, especially novice drummer Copeland. Then, for reasons no one could pinpoint, the musicians suddenly "clicked" with each other and the band caught fire, quickly becoming a popular and acclaimed live act. Their studio efforts were another story, however. Phil Kohn left and the band, unable to replace him in time for the sessions for Midnight Wire, relied on guest musicians to play both bass (John G Perry) and keyboards (Peter Wood). Norma Tager, a friend of Kristina's, penned the lyrics to the "Midnight Wire" songs. Kohn was later replaced by Tony Reeves, formerly of Colosseum and Greenslade, but the recording sessions for both Midnight Wire and 1976's Airborne were expensive and highly stressful for everyone involved. Both albums - as well as "Desiree", a single drawn from Airborne - failed to break the charts. Citing dissatisfaction with BTM Records' inability to support Curved Air financially, Way departed. Though Alex Richman from the Butts Band stepped in on keyboards, the loss of the band's de facto leader was a blow. This line-up's last-ditch attempt at a hit single, a cover version of "Baby Please Don't Go", was another flop. After months of gradually losing steam, Curved Air broke up so quietly that, by Sonja Kristina's recollections, most of the music press wrote off the band's absence as a "sabbatical". Copeland formed The Police, Reeves returned to work as a producer and played in semi-pro band Big Chief along with Jacques, and Kristina and Way both pursued solo careers. Kristina and Copeland maintained the close personal relationship they'd formed while bandmates and were married in 1982.

What did they do when they were unable to replace him?
relied on guest musicians to play both bass (John G Perry) and keyboards (Peter Wood).