What the British mark covers, and what it leaves alone
An apostille is a printed slip that confirms a named official really signed the sheet beneath it. It states that the signature is genuine and the seal belongs to the body that used it. It does not read the text, judge the claim, or promise that anyone abroad will act on it. Knowing that boundary saves a great deal of wasted effort later on.
Why the Emirates ask for a second stamp
The United Arab Emirates has not joined the Hague Apostille Convention. Where a country stays outside that agreement, the older chain of stamps survives untouched, so a British sheet has to be marked twice over. Document legalisation for United Arab Emirates therefore means the British mark first and a consular stamp after it, never one in place of the other.
That narrow job explains a common shock. A sheet can carry a faultless British mark and still be handed back in Abu Dhabi, because the mark was never the thing being asked for. What an Emirati desk wants is a stamp added by staff acting for its own government, and that is a separate errand with its own queue and its own pace.
The British half, priced by the sheet
One office marks papers for every city in the country and it runs wholly through the post, so there is no desk in Stoke-on-Trent to call at. The published charge falls on each document rather than on the envelope, and there are two rates: the standard postal one, and a lower next-day one open only to registered businesses.
The first useful task is therefore counting. An apostille from United Kingdom to United Arab Emirates costs the same whether the sheet is a degree or a police record, so a bundle of four costs four times a bundle of one. Trim the set down to what the Emirati reader actually named before a single envelope is filled.
Planning around the stage nobody here controls
The British half behaves the same way for every file it sees, so it is the part you can plan around with confidence. The consular half is the one that sets the real date, because it depends on a queue no office here runs. Where a start date or a visa appointment is already fixed, work backwards from that second stamp rather than forwards from the first.