Which route applies for Syria
An apostille is a single certificate that Convention countries agree to take from each other with no extra step. Syria has not joined the Hague Apostille Convention, so that route stays shut. Papers going there need document legalisation for Syria instead: the UK certificate first, and then a stamp from the consular desk acting for the country. Both marks belong on the file before it travels.
Only what is attached counts
Every office on this chain works from what is in front of it. The FCDO Legalisation Office matches a signature against a sample it already holds. The consular desk looks at the mark that office left. The clerk at the far end looks at both. None of them ever hears from you, so none of them can be told anything that is not written on a sheet in the envelope.
That has a plain effect on how you spend your effort. Time given to explaining yourself is wasted, and time given to getting the right sheet, correctly signed, is not. An apostille issued in Newcastle upon Tyne for use in Syria is a mark on one specific page, so the page it sits on is the whole of your case.
Building a file that speaks for itself
Newcastle Register Office, at Civic Centre, Barras Bridge, Newcastle upon Tyne NE1 8QH, re-issues civil records as certified copies, which is why the certificate you keep at home never needs to be in the post. A paper from a court, a school or a company starts with the body that signed it, because that signature is what the next stage looks for.
The sheet then goes to the FCDO Legalisation Office, PO Box 6255, Milton Keynes MK10 1XX, which handles the whole country by post. What you need for an apostille for Syria at this point is simply a recognised signature on an unaltered page. Nothing there rewrites a record, and nothing there reads the meaning of one.
Cost and timing on this route
The UK stage has a published charge: £45 per document by standard post, or £40 per document on the next-day service open to registered businesses. An apostille from the United Kingdom to Syria is only the opening mark, so the consular stage carries its own price, set by the mission that applies it. Allow for two waits as well as two charges, and send everything tracked.