1990s BBC TV action-drama series starring Jaye Griffiths and Jesse Birdsall (4)

I believe the answer is:

bugs

(Other definitions for bugs that I've seen before include "Insects or faults in a system or machine" , "Program errors" , "Insects or defects in computer programs" , "taps" , "Small crawling creatures or disease-germs" .)

I've seen this clue in The Mirror.

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