Accra, Aug 11, - A week-long exhibition mounted by the British Council and depicting Britain's relationship with Ghana from the colonial era to the post-independence period opened in Accra today. It was characterized by pictorial presentations labelled ''Beginnings to future friends'' and books on Ghana's political development and contemporary Britain dubbed ''The Rising Black Star'' and authored by Ghanaian and British writers. The exhibition which opened in London in June, this year, is British Council's contribution to Ghana's 40th independence anniversary celebration. It will travel to Kumasi, Takoradi, Cape Coast and Tamale. Britain formally colonized the Gold Coast (Ghana ) in 1847 and granted independence to its model colony in 1957. Its investment in Ghana is in the region of 500 million pounds sterling. Mr David Wyatt, Acting British High Commissioner in Ghana, said the exhibition presents a thriving and on-going partnership between the two countries and not ''a nostalgia trip by ex-colonialists''. ''It conveys a message that Ghana's partners and friends are enthusiastic about its future and we in Britain want to continue to work with you into the millenium in the true spirit of partnership,'' he added. Mr Kofi Sekyi, Director of Information Services, said Ghana had gained immenmsely from Ghana's relationship with Britain.