I would have presumed so, Atticus. I wouldn't have thought that Duvel, in particular, would sell in such quantities as to make it a target unless of course it's coming from the UK.
That said, I've kept the bottle from my last instance and have contacted Duvel about it just out of curiosity.
What's interesting is that the bottle from Tesco has some differences in it's label compared to Duvel bought in an Off License.
This might be due to a label change or end of label run but it's curious all the same. I'm hoping a rep from Duvel will get back to me about it and if they do I'll post it here.