https://www.lexus.co.uk/owners/warranty/manufacturer-warranty/
You mentioned the UK above, Toyota, and the Lexus corner of the office, operate as Toyota GB - the warranty may be the same in NI too but I don't know.
Obviously the website may change over time so here is a quote from it:
THE BENEFITS OF LEXUS WARRANTY
From last-minute business trips to weekends away, the Lexus manufacturer’s warranty ensures that every trip runs smoothly. With 60,000 miles cover for mechanical faults and five-year warranty for both hybrid components and hybrid battery, our standard warranty delivers complete protection for confidence on every journey.