Reginald Perrin's middle name in the sitcom starring Leonard Rossiter (8)

I believe the answer is:

iolanthe

(Other definitions for iolanthe that I've seen before include "G&S piece" , "Gilbert and Sullivan opera" , "G&S's eponymous fairy" , "one of 63 [OPERETTAS]" , "G&S operetta" .)

I've seen this clue in The Independent.

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