Apostille vs. Embassy legalisation for United States
The older way of proving a signature abroad involves the receiving country directly: its own officials examine the file in Britain before it counts at home. The treaty way replaces that with one certificate that member countries accept from one another. An apostille for United States takes the treaty way, so the second government never appears in your calendar, your budget or your correspondence.
United States's Hague status & what it means
The United States joined the Hague Convention in 1981, and the United Kingdom belongs to the same treaty. Because both ends are covered, an apostille from the United Kingdom to United States is complete as issued and no further body handles the sheet. The saving is not only a fee; it is the removal of the one stage whose length nobody on this side can predict.
Everyone you deal with is in Britain
Look at who actually touches the paper. A register office in Plymouth, if the document is a civil record. The Legalisation Office, working by post from a single address for the whole country. Then you again, with a certified document in hand. Three parties, all governed by the same rules, all reachable in the same language of process and all working to the same working week.
That has a practical consequence for planning. Where a second government is involved, the timetable has a section nobody here can quote and a charge nobody here can name. On this corridor there is no such section, so the job is finishable to a plan: order the certified copy from Plymouth Register Office at Derriford Park, send it, receive it back, and the certification chapter is closed.
Cost & timing for this route
The charge is £45 for each document by post at the Legalisation Office, or £40 for each on the next-day route open to registered businesses, and it is the only certification charge on this route. Timing is not pinned to a figure here, but it has only three components: your post out, the office's handling, and the post back. Nothing waits behind them.
Destination-specific requirements
The United States accepts the certificate as issued, so the preparation is all at the front: the right version of the record, a certified copy rather than a photocopy, correct details on it, and one certificate for each document that needs one. Once the envelope comes back, the British side of the matter is finished, and what remains is simply getting the paper to whoever asked for it.