Just a quick update to say that the kit is in the FedEx depot at Stanstead airport.
It seems it can't be released until I supply an EORI number which I have applied for today.
Normally turnaround by HMRC for these is 48/72 hours, but they are currently taking 5-7 days.
This means the kit may not be released until early January.
But at the end of the day, this should not impact on my expected posting timescales anyway 