Here in Britain classification is by a suitably qualified examiner.
At a suitably qualified English Language Assessment Centre approved by the UK CAA. There are only 4 such centres in the UK one of whom only offers this service to their own students.
The organisations are:
Anglo-Continental Educational Group Limited Bournemouth
Language Testing and Assessment Services Ltd Bournemouth
Mayflower College of English Ltd Plymouth
CAE Oxford Aviation Academy Oxford
As ELP assessments only appeared to be recognised by the state that issued it, any ELP testing should be combined with the relevant licence training.