1. You could start by reading, or dipping into, one of the good critical texts that address postwar Black and Asian British writing. Good starting places include: James Procter, Dwelling Places: Postwar Black British Writing (Manchester University Press, 2003), James Procter, Writing Black Britain: 1948-1998 (Manchester University Press, 2000), Susheila Nasta, Home Truths: Fictions of the South Asian Diaspora in Britain (Palgrave 2002), John McLeod, Postcolonial London: Rewriting the Metropolis (Routledge, 2004), Dave Gunning, Race and Antiracism in Black British and British Asian Literature (Liverpool University Press, 2010).
2. You could also start by reading historical accounts. The founding text, and still the most important, is: Peter Fryer, Staying Power: The History of Black People in Britain (1984). You might also look at: Rozina Visram, Asians in Britain: 400 Years of History (Pluto, 2002) or David Dabydeen et al. (eds), The Oxford Companion to Black British History (Oxford University Press, 2008).
3. You could start looking out for relevant events and exhibitions – particularly around South Asian Heritage Month (July – August) or Black History Month (October).
4. You might also pay a visit to the irreplaceable New Beacon Books, 76 Stroud Green Road – the best source for Black British writing, and also highly important to the history of Black writing in Britain.