Got to hand some praise to Samsung's support teams. I never received the £50 discount code from the unpacked event, bought the phone then remembered about the code. Took 20-25 mins on their live web chat to be given a £50 voucher to spend on their website. Picked up the anti-glare screen protectors and the battery pack. Had to pay an extra few quid, but I was going to buy the screen protectors anyway.
If the S24 Ultra is anything like my S22 Ultra then it's going to need a screen protector. I've never owned a device that scratches as easily. It's brushed off the drops etc with no cracking, but is covered in tiny little scratches presumably off my pocket (which never has anything else in it).