In the immigration rules it is written:
The minimum standard an applicant in the partner or parent routes must meet is, as appropriate, level A1 or A2 of CEFR in speaking and listening skills. If they wish, applicants can pass an approved test at a higher level to meet the requirement which applies to their application.
Every English language test taken on or after 6 April 2015 by a partner or parent applicant must meet the new requirements in respect of the approved tests, providers and secure test centers offered by Trinity College London or the IELTS SELT Consortium.
Well, the test was passed in the approved location - IELTS SELT Consortium GBS02 British Council, London West