What Kenya accepts, and what it does not
Start with the plain answer, because it changes everything after it. Kenya has not joined the Hague Apostille Convention, so an apostille for Kenya is not the stamp that opens the door there. Document legalisation for Kenya runs through the consular route instead: the UK stage first, then a stamp from Kenya's own mission. People still search for an apostille from United Kingdom to Kenya, and it is an easy thing to get wrong, since the same word covers the shorter route to many other places.
Who can carry the paper through
This is a route made of envelopes, not appointments, so the person named on the record rarely has to touch it. A daughter in Sunderland can order the copy, a firm can send papers for a member of staff, and an executor can act for an estate. None of that changes what is written on the paper. The owner stays the owner; the helper is simply the sender and the address the bundle comes home to.
Two names on one job can still cause muddle, and the cure is a sentence. Say who is asking, who the record is about, and where it must come back to. Where a body in Kenya wants a letter from the owner allowing someone else to act, write that letter early and keep it with the bundle. It costs nothing and it removes the one question a clerk cannot answer alone.
The Sunderland to Kenya route in order
The first move is local. Sunderland Registration Service issues certified copies of civil records, so a helper can order a fresh copy and the family keeps the paper it has always had. That copy is the one that will be marked. It then travels to the FCDO Legalisation Office, whose clerks compare the signature on it with the specimen they hold, and who work only by post. The consular stamp comes last, and until it is on, the bundle is not finished.
What the Kenyan stage asks for
The far end sets its own terms, and they are usually about who is asking rather than what the paper says. A body in Kenya may want the request in the name of the person the record concerns, may want a set of papers together rather than one sheet, and will want the UK stage done first. So an apostille issued in Sunderland for use in Kenya cannot be bought as a shortcut past that. Plan the helper's part around the fuller route and nothing later comes as a shock.
Money, and who pays it
Payment is another thing a helper can take on. The £45 standard fee per document is charged by the FCDO Legalisation Office and does not depend on who wrote the cheque. Where an employer is sending papers for several people, the next-day tier at £40 per document is open to registered businesses and can be the cheaper as well as the quicker choice. Beyond that stage the consular charge and the postage sit outside these figures, so agree in advance who is carrying which cost.