A chain of signature checks
Nobody on this route reads your certificate for meaning. Each desk confirms that the mark left by the desk before it is genuine, by comparing it against a specimen already on file. Nepal has not joined the Hague Apostille Convention, so embassy legalisation is required and the chain runs one link longer than it would to a treaty country.
The first link, made in Edinburgh
The chain starts with a signature a British office can recognise. Edinburgh Registration Service at City Chambers, 253 High Street, Edinburgh EH1 1YP, prints certified extracts of Scottish births, marriages and deaths, and the officer who signs one is on record. That is why an extract works where a photocopy of the same wording does not, however clear the copy looks.
The British link in the chain
The FCDO Legalisation Office is the United Kingdom's authority for apostilles. It works by post from Milton Keynes with no public counter, matches the signature it receives against its samples, and attaches its own slip. The charge is £45 for each paper, or £40 for each paper on the faster route open to registered businesses, counted per paper rather than per envelope.
The link that finishes it
An apostille from United Kingdom to Nepal carries the file as far as the British system can take it. The final link is added by officials acting for Nepal, who look at the British mark and add one of their own. Until that happens a Scottish paper has no standing in Kathmandu, however many British stamps are already fastened to it.
Nepali, and keeping the links intact
Nepali is the language of official record in Nepal, so an English extract commonly travels with a translation beside it. Beyond that, the practical rule is simple: never separate what has been fastened. A slip torn loose breaks the very link it was there to prove, and document legalisation for Nepal depends on the bundle arriving whole.