My last school gave me the letter and I personally had to take it to my line manager, who was a foreigner, to fill in the 'job performance' box which apparantly can be done in English. Anyway, they also scanned it for me so I could email it ahead of the hard copy, so yeah, a little fishy.
On the other hand, we all know how most things are often done at the last possible minute here with no malice intended, so....