LISTEN TO 6 CALLSIGNS TRANSMITTED AT 25 WORDS PER MINUTES [WPM] FOR RESPECTIVELY:-

MFV816 -   MJVW
MFV1004 - MZTP
MFV1044 - GLPF
MFV1051 - GBWZ
MFV1139 - MVJK
MFV1207 - MVKQ

The series is transmitted twice.

Note MFV 1051's callsign, the third letter 'W' after which comes 'X': her callsign is literally one letter away from GBXZ = ALL {OR ANY} BRITISH WARSHIP.