It appears that our request has hit a wall before it’s even started.

I contacted Tesco today to ask why they hadn’t been in touch to confirm my identity.  They had no record of the letter arriving.  After showing them the Royal Mail proof of delivery and a bit of toing and froing, it appears that the letter has been received, but not processed correctly.  They believe it has been re-sent to their head quarters in Cheshunt, but the person who deals with these requests has gone home for the day (surprise, surprise).  I’ve been promised a call back tomorrow.