The information was still useful. We had only applied on Friday so I was able to return the letter of authority and the passport on Monday morning. That is well within the two working days stipulated in the link you sent.
The first formal complaint elicited a deliberately misleading response. So I replied very firmly and reserved my costs. The next response defies belief - note for readers the website link to gov.uk that outlines the letter of authority procedures is still "up";
"Thanks again.
I have escalated your feedback to the UKVI for their advice. I apologize that the LOA process is no longer available since 1 Apr 2014 when UKVI introduced the Passport Passback service."
It is still there on gov.uk!!!! And the alternative "passback" effectively surcharges Macau residents at least £100
Now getting pretty riled I researched the contractor employed - VFS. Oh dear, do they have a bad reputation or what. The Home Office has had a formal reprimand for their conduct from the ICO. Some of their conduct in Thailand if truly reported is criminal!
I note VFS are also the contractor in Manila. I'd be interested in hearing any experiences of dealing with them.
OH and VFS have now got an invoice from me of just over £1,300 comprising reimbursements, travel costs, one day off work and 6 hours filing of complaints. The rates charged are all at exactly the same time and item rates as they charge applicants - viz effectively £1.37 per minute. Future costs reserved too - should be fun.