For decades Saudi Arabia’s oil wealth and conservative ruling family have ensured a stable ally for the west in the Arabian Peninsula. But a ruthless heir apparent and tumbling oil prices, compounded by a looming fiscal crisis and regional instability, have raised huge questions about the Kingdom’s future. Dr Neil Quilliam, an associate fellow in Chatham House's Middle East & North Africa Programme, and Sir William Patey, the former British Ambassador to Saudi Arabia, discuss the uncertainty surrounding the Kingdom's future.