Welcome to this user forum @ThomasHowarth
Once the cooling off period has passed (14 days after the activation date), you'll receive an email with a code to claim your free gift.
Once you have received your code, you can select your free gift from the BT Shop here - https://shop.bt.com/other-pages/bt-customer-offers/bt-broadband-march-2019-offer/
I also placed my order recently and I got the offer for free tech and BT reward card. Its been 20 days since connection activitation at my property but I have not received the email from BT for Free tech. After googling about this I found the link to claim my reward which I just did. So I got my reward processed but there is no information to inquire about Free tech?
Who should I contact in regards to that?