The Cambridge ESOL exams are related to the Common European Framework of Reference for Languages (CEF). This framework sets standards in foreign language teaching across Europe. It divides learners into six levels of ability, with descriptions of what a learner is able to do at each stage.
A1/0 is the level of the very beginners. Some awards are mapped onto this level, including YLE Starters/Movers, and Entry 1 Certificate in ESOL Skills for Life. However, a candidate would receive 1.0 for IELTS, or 0 for BULATS, if he/she left the testing papers blank. Thus, 1.0 for IELTS, or 0 for BULATS, should not be treated as an "award".