The gap between the request and the road
Kuwait has not joined the Hague Apostille Convention, so a British mark on its own does not answer for a paper used there. Documents going that way need embassy or consular legalisation instead: certification by the FCDO Legalisation Office, then a consular stamp on top of it. The request handed to you almost certainly did not put it in those terms.
Where Kuwait stands
An apostille is not accepted for Kuwait. That is the whole of the status, and it does not bend for a particular employer, university or court. Once you know it, the wording of the original request stops being authoritative and becomes what it always was: shorthand for making a paper usable abroad, written by somebody who was not thinking about roads.
Turning the request into steps
Begin from what the person asking genuinely needs, which is a paper that will be accepted where it is going. Then lay out the road that delivers it: a certified copy from Nottingham Register Office where the record is a civil one, certification by the FCDO Legalisation Office, and last of all a consular stamp. Three concrete things, and none of them the word you were handed.
Sending that description back early is worth more than it sounds. Deadlines are usually set by whoever wrote the original request, and they are set on the assumption of a single-stage job. A road with two stages and two waits needs its deadline reopened at the beginning, not defended at the end when nothing can be moved.
Cost and pace behind the correct name
The Legalisation Office publishes £45 / document (standard postal) and £40 / document next-day (registered businesses), charged on each sheet that passes through it. Beyond that sits the consular stage with a charge of its own and a pace of its own, neither of them settled in Britain. Two figures in total, and only one of them printed where you can go and find it.