Whether I've been briefed by a CAAFU examiner or not I don't think is relevant, and don't see how you think it is.
It is entirely relevant.
During the preflight brief the CAAFU examiner needs to ascertain that there is nothing unclear about his/her expectations of the flight -- he/she is self-loading freight, will comment little and direct even less.
This understanding is critical, lest we in CAA/JAA land endup with a situation where the candidate blames an inflight bad decision on, say, an interruption from the RHS, or an unclear instruction...
Given the US' preoccupation with litigation I am surprised they don't prebrief to the same extent.
(that plus working in a not particularly convenient part of the country).
Yes, checking my atlas I can see that Filton is considerably closer to West Coast USA than it is to Gatwick, Bournemouth, Bristol, Oxford or Cranfield