It will be the earlier date. For the most up to date info tweet @vwukhelp and they will let you know whats going on.
Mine was the same as above, tracker told me 01 February.
Yet when I logged in to VW it was saying 08 February.
I emailed @vwukhelp as they have been great in the past. They came back saying it was a confirmed build week of week 6 (w/c) 01 February.
I thought nothing more of it until I was on the week numbers
http://www.epochconverter.com/date-and-time/weeknumbers-by-year.php where it says week 6 is (w/c) 08 February.

So I went back to @vwukhelp asking for a bit of clarification. "Apparently VW sometimes go with different week numbers"
You couldn't make it up. No wonder they are in such a state