Same experience as these guys mostly.
I followed up about the BTS offer online first, however, and that had me worried a little. The assistant said I had been misinformed about being able to claim the gift card after an order was made, but that I should phone Apple up to see if anything could be done.
So I called Apple, and very quickly I was told I would be able to get the gift card without having to return my MacBook. I ordered on 24 Jun, and my MacBook will arrive today. The woman I talked to wasn't sure whether the gift card would be sent via post (mail) or email, but said she'd try and find out and then email me letting me know. Great support.
Edit: The rep I talked to on the phone did indeed email me back, and said to expect the gift card via email within 3-5 weeks.