https://www.slab.org.uk/faqs/documents-less-than-300-words/
For documents of less than 300 words, a minimum charge of £28.50 will normally be allowed.
For “formal” documents such as marriage and birth certificates where there is minimal information but multiple documents require to be translated, we would expect the £28.50 charge to cover all certificates.
In determining the fee payable, we will have regard to the type of document translated.