Yes, as a Qualified Member of the Institute of Translation and Interpreting (ITI) in Spanish to English, I am able to provide certified translations in this language pair. I hope to become qualified to offer certified French to English translations in the coming year.
All official document translations are charged at £0.08 per word, with a minimum charge of £45. Certification (providing a letter and seal, plus recorded delivery) carries an additional fixed fee of £25.
To read what the Institute of Translation and Interpreting (ITI) says about certified and other official translations, please click here: https://www.iti.org.uk/language-services/official-translations