From the Wikipedia entry for PGCE:
The PGCE (QTLS: Qualified Teacher, Learning & Skills) is an alternative professional qualification for anybody teaching in the post-compulsory education and training sector (PCET) i.e. further education colleges, sixth form colleges and centres, adult education, community learning, prison education and a wide range of other training and educational settings that are outside the schools sector. Trainee teachers in this sector will normally complete their PGCE (PCET) qualification in one or two years and will then apply for professional formation (obtain QTLS) in their first years of employment that follow.
According to the [IfL]http://www.ifl.ac.uk/qtls-atls: “All teachers that have had their first teaching position within the sector since September 2007 are required to undertake and complete Professional Formation (obtain QTLS) within 5 years of their first appointment. Teachers who were employed in the sector before September 2007 are not required to achieve QTLS or ATLS, but are encouraged to do so as a demonstration of the currency of their teaching practice”.
Teachers with this qualification are entitled to teach in Further Education (FE) and Sixth Form Colleges, and this is a recognised teaching qualification in a range of post-compulsory education settings. Currently teachers with PGCE (QTLS) are not entitled to teach in schools. Teachers with this qualification may still be employed by schools (e.g. to teach A-levels in a school sixth form) however they will normally be classed and paid as “unqualified”.