“Gas!” Parry Percival said under his breath. Martyn, who thought the Doctor was
 doing well, glanced indignantly at Parry and was astonished to see that he looked
 frightened. “ ‘—therefore,’ ” the Doctor was saying arrogantly, “ ‘to beg will not
 become me—’ ”“Gas!” said an imperative voice off-stage and someone else ran noisily
 round the back of the set.And then Martyn smelled it. Gas…
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