At any one time not all the Filton IMPs used the same cancel. One can identify which IMP a particular cancel came from by looking at the first digit of the 8-digit code at the bottom of the date block.
Between April and July 1998 a "Royal Mail / Bath / Bristol" cancel was in use (IMPs 5 & 2 shown) ...
... and from January 1998 a "Royal Mail / Bath Bristol / Taunton" cancel was being used (IMP 3).
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