Nothing on the form is tidied away
A form is not only what somebody wrote on it. The gaps count too: a box left empty, a line ruled through, a field answered with 'none'. A certified translation into Arabic in Leicester keeps all of that. The translator marks an empty field as empty rather than skipping past it, so the Arabic reads with the same holes in the same places as the paper it came from.
Why a gap matters to a reader in Mauritania
A clerk in Mauritania wants to know whether a fact is missing or simply absent. Those are two different things. If your English form has no entry against a father's name, the Arabic must show that the box was blank, not quietly drop the line. A certified translation in Leicester for Mauritania is built so a reader can find the same gaps in both versions and draw the same conclusion from them.
The form of certification Mauritania takes
The Arabic pages are certified in the shape consulates and ministries accept: the translator signs and dates a statement that the Arabic matches the English. That is what makes a certified translation for Mauritania usable at an official desk rather than a private convenience. Arabic is the language those desks work in, so the Arabic version is the one they will read first and rule on.
The rate and the clock
Work is priced at £25 a page, so a short certificate costs less than a long court file, and a sparse page costs the same as a crowded one. Standard turnaround is 3–5 business days from a legible scan; express brings that down to 48 hours. An official Arabic translation in Leicester is quoted the same way whatever the paper is for, and only the speed you pick moves the total.