Well this is great...I sent them a message and they refuse to give me the upgrade as I left it too late after my order. I was a bit of a noob with it but I had NO idea how it was going to work so I just waited. I read up about it and some people said they just send it to you after the release. Hmm...guess I'm going to have to get the student upgrade and spend £30! Would have been nice to have SOME info about it if I wasn't going to get a voucher with it, which wasn't my mistake.
Have any of you with dell tried thier website to register for the upgrade. https://win7.dell.com/Default.aspx
I'm having the same issue at the moment with Dell. My father-in-law bought an Inspiron off the shelf from a high street mobile phone company (with no phone or broadband - just the laptop), didn't receive a voucher even though it was advertised as a free upgrade to W7, Dell aren't being very helpful and niether is the high street shop. Spent over an hour on the phone to Dell being pushed around different departments before giving up.
I would say ring trading standards, see what they say.