"Royal Mail / BA, BS, GL, TA / Mail Centre" Inkjet cancel ... and others

The Royal Mail centre near Filton, Gloucestershire processes mail from the Bath, Bristol, Gloucester and Taunton areas, using a single "Royal Mail / BA, BS, GL, TA / Mail Centre" inkjet cancel that does not indicate where the mail came from.

So here is an example from Bath (from a well-known stamp dealer with his address label on the reverse):

This next sheet has two more examples of exactly the same "Royal Mail / BA, BS, GL, TA" cancel, but this time the first is from Easton-in-Gordano so is in my collecting area of Somerset and the second was posted in Cheltenham so is not.

The third cover above just has 7 wavy lines (nothing indicating where or when it was posted) ... and happens to have been posted in Cirencester - so not in my collecting area but should have received the same "BA, BS, GL, TA" cancel.

The two covers below were posted in Bath and were received on the same day, the first with multiple strikes of the hand canceller issued to all postmen and the second with the same 7-wavy line cancel as on the bottom cover shown above.