Britain is realising it has another national treasure: Wilko Johnson, the goggle-eyed guitar hero of Dr Feelgood. Earlier this month, 65-year-old Johnson announced his diagnosis with terminal pancreatic cancer and, with impish logic, his farewell tour in February and March. Then, on Radio 4 on Friday, he shrugged off his prognosis in his unmistakable Essex twang with the statement that he felt "vividly alive … it probably takes [imminent death] to knock a bit of sense into our heads."