The machine - MFC-L2703DW.
Sorry - didn't mention the machine, as the destructions looked almost generic, if a little dated.
The Model 2703 appears to be unique to .au, and Officeworks at that - it pops up on the .au site but not the worldwide "en" support pages.
Following the .au site gets us to uninstall instructions.
Following the 'world' en site gets to installation instructions, GUI and otherwise.
Mystery. Is good.
FWIW, I'm most interested in sending a facs to/and then from the MFC machine direct from LibreOffice.
Hoping of course that such will work for all the 2 and probably the 7 series machines.
Added on edit - the subject software is a simple "printer" by Brother , I recall having it present as such in a previous Linux distro, and I didn't need to use the GUI at all.

On shannon stable. Done did it anyway, no errors. Package works.
Printer OK, Won't print the CUPS self test page. (Big deal, not.) Will print stock test page.
Still no facs. Simple scan can't see the scanner. sudoing it sets it about finding and failing.
Captain Obvious tells me the scanner driver isn't part of the package:-)

sunnyflunk: For the MFCL2703DW. As for the comment to datadrake I'd saved up for a while, Scanner and Facs still no-show. Printer running fine. The 2703 appears to be a speshul model for Office Works (.au)
"
lsusb
Bus 006 Device 002: ID 8087:8001 Intel Corp.
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 004 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 003: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 002 Device 002: ID 04f9:0331 Brother Industries, Ltd MFC-L2700DW
Bus 002 Device 005: ID 046d:c31f Logitech, Inc. Comfort Keyboard K290
Bus 002 Device 004: ID 1af3:0001
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
"

For Datadrake - I'm managed to get my Brother MFCL2703DW to print, using Solus install printer - totally avoiding Cups. That's all it will do, however - no scanner/facs at all. Cups actually has NFI who I am - telling me I'm either anonymous, or Withheld, depending on the origin of the print command. Cups also doesn't collect a page count, FWIW. Thanks for stepping up on this one.