Apostille vs. Embassy legalisation for Mali
Mali has not joined the Hague Apostille Convention, so one British certificate does not finish a paper used there. Documents heading that way need embassy or consular legalisation instead, which puts a second desk behind the first. No apostille issued in Glasgow for use in Mali is a complete file by itself, whatever order the offices are visited in.
Mali's Hague status & what it means
Outside that treaty the job is a chain, and a chain has a fixed direction. Every desk works from the mark left by the desk before it, which is why the starting point deserves more attention than it usually gets. Choose the wrong first counter and nothing later in the chain can quietly correct it for you.
The Glasgow → Mali route step by step
Glasgow Registration Office at 45 John Street, Glasgow G1 1JE deals in Scottish civil records and prints certified extracts of births, marriages and deaths. It is a government counter, not one of ours, and its job ends when the extract is handed over. Everything it does concerns the record itself rather than any country the paper is bound for.
The FCDO Legalisation Office at PO Box 6255, Milton Keynes MK10 1XX is the other British desk, and it is a single central office serving the whole United Kingdom by post. It speaks for the signature and seal on the extract. Document legalisation for Mali then continues at consular level, working from that British mark rather than from the register entry.
Cost & timing for this route
The British charge is £45 / document by standard post, or £40 / document next-day where the sender is a registered business, and it is met per document rather than per envelope. An official charge follows at the consular stage. An apostille from United Kingdom to Mali is one line of the bill, and the Scottish extract that starts it is another, smaller one.
Getting the first stop right
Decide which entry you mean, order the extract in the number of copies somebody abroad actually wants, and read it closely while it is still unmarked. That is the whole of the work you control. After the extract leaves your hands the route belongs to other offices, and none of them will go back to the Scottish counter on your behalf.