I can generate a code that gives you £30 off orders of the EV charger made on the Hive website. Is that the one you mean?
Edit: if that is the one, Robgul, you could try in the app, go to Account, Refer a Friend, and it comes up with a page about getting a free light if your referee buys the hub. But, at the bottom of that page is a "give £30 off" which is for the EV charger. As the referrer, you get £15 off. I don't intend buying any more Hive kit so wouldn't use that £15, but if you would, and it's the code L CC wants, then go for it...