The country is the first fact, not a detail
People usually start with the document, because that is the thing they can hold. The route starts somewhere else. Where a paper is going settles how many desks it must pass, how long it stays away and what it costs, and none of that shifts with what the document happens to say about you.
So what you need for an apostille for Somalia begins with the word Somalia, not with the sheet in your hand. Settle the destination and the later choices — how many copies, which body issues them, how much room to leave in your own plans — all fall out of it without much further argument.
Where Somalia stands
An apostille for Somalia is not the certificate that ends the job. Somalia has not joined the Hague Apostille Convention, so the shortcut that works between member countries is not on offer here. Document legalisation for Somalia goes through consular offices, which puts a second desk after the British one and a second charge alongside it.
That is why an apostille from United Kingdom to Somalia is better thought of as a first stage than as a finished piece of work. And there is no apostille issued in Manchester for use in Somalia to be collected locally: the mark is applied elsewhere, by post.
The paper and the office behind it
Every document has a body that made it, and that body is where a clean copy comes from. For births, marriages and deaths registered in the city, Manchester Register Office at Heron House, 47 Lloyd Street, Manchester M2 5LE issues certified copies, so the sheet you keep at home never has to join the errand at all.
The Legalisation Office (Foreign, Commonwealth & Development Office) then handles that copy from PO Box 6255, Milton Keynes MK10 1XX and charges £45 for each document by standard post. It deals with everything by post, so the lines you write down stand in for the conversation you would otherwise have across a counter.
Where it comes back to
The last piece of the puzzle is the least glamorous and the easiest to fumble. A postal route ends at an address, and a file returns to the one it was given rather than to the person who paid. Pick somewhere that will still reach you when the job closes, and tell whoever lives there that an envelope worth keeping is on its way.