Fairly accurate, BigGrecian, but not 100% accurate .
The TEA is recorded during the interlocution process and the recording is thereafter assessed by a rater (often the interlocutor and the rater are one and the same person, e.g. I do both).
The rating is entered on to the TEA admin website by the local administrator and the recording uploaded to TEA via a 'dropbox' program.
TEA then randomly 'double-rate' approximately 1 in 10 from each assessment centre, making any adjustments to the original rating as they see fit - it is for this reason that we cannot tell candidates their grade at the time of the assessment......although they sometimes beg.....

......the power!!!
(Good to see that EFT is doing formal assessments and not using the barmy CAA informal assessment process which is letting persons who can barely mumble in English through with Level 6'es.)