In short – a vocational qualification that is equivalent to 3 A Levels.
There are 3 starting in September 2020 (Digital Production, Design and Development, Design, Surveying and Planning, and Education) and about 7 more the year after, although it might be a few years before your local school or college offers them.
For more information see https://zigzageducation.co.uk/go/t-levels
ZigZag Education 