Dietrich Bonhoeffer, Christology (Collins, 1960) — part two is especially useful.
Markus Bockmuehl (ed.), The Cambridge Companion to Jesus (CUP, 2006)
David Ford and Mike Higton (eds.), Jesus (OUP, 2002) — a terrific compilation of short texts.
Ben Quash and Michael Ward, Heresies and How to Avoid Them: Why it matters what Christians believe (SPCK, 2007) — mainly on Christological heresies and why these questions matter.
Stephen W. Need, Truly Divine and Truly Human: The story of Christ and the seven ecumenical councils (SPCK, 2008)
Jaroslav Pelikan, Jesus Through the Centuries: His place in the history of culture (Yale, 1985)
Larry Hurtado, How on Earth Did Jesus Become a God? (Eerdmans, 2005) — explores the very early development of devotion to Jesus.
Kathryn Tanner, Jesus, Humanity and the Trinity (Fortress, 2001) — a brief and readable reinterpretation of classic Christology.
Tom Wright, Simply Jesus (SPCK, 2011), and, writing as N. T. Wright, The Challenge of Jesus and Jesus and the Victory of God (SPCK, both 2015)
Olivier Clément, On Human Being: A spiritual anthropology (New City Press, 2000)
Marc Cortez, Theological Anthropology: A guide for the perplexed (T&T Clark, 2010)
E. L. Mascall, The Importance of Being Human (OUP, 1958) — dated in some respects, but still one of the best studies.
Theology and Preaching
Frederick Buechner, Telling the Truth: The gospel as tragedy, comedy, and fairy tale (HarperOne, 1975)
Darrell Johnson, The Glory of Preaching: Participating in God’s transformation of the world (IVP, 2009)
Fred Craddock, Preaching (Abingdon, 2010)
John Stott, I Believe in Preaching (Hodder & Stoughton, 1982)
Jeff Astley, Christian Doctrine: An SCM Studyguide (SCM, 2010)
Mark McIntosh, Divine Teaching: An introduction to Christian theology (Blackwell, 2007)
Eric Lionel Mascall, Via Media: An essay in theological synthesis (Longmans, Green and Co., 1956) — a magnificent survey in only four themes.
D. Brent Laytham (ed.), God Is Not. . . and God Does Not (Brazos 2004 and 2005) — punchy and provocative, and of relevance beyond their immediate American audience.
Colin Gunton, The Christian Faith: An introduction to Christian doctrine (Blackwell, 2001)
Ralph McMichael, The Vocation of Anglican Theology: Sources and essays (SCM, 2014)