The UK and Ireland Testing Board partner with a number of training providers to provide English certifications to the UK Market.
In the UK the demand for the Expert training and exams has not been high. Our training providers have decided not to develop the courses as they are expensive courses to develop until or unless the demand increases. There are training providers who do conduct the training in English, please search https://www.istqb.org/istqb-where-you-are/find-a-training-provider.html for their details.