For the sake of £12 I would buy it from Samsung Direct.
You'll be eligible for any beta software if that's important to you in future and you'll get the right region device.
In some cases cheaper devices, whilst genuine, may come from other parts of the world and may cause you some concerns.
If the price difference was large, then maybe but for me, not for £12.
Maybe see if Samsung might do you a deal over the phone or see if they'll throw a charger in or something. Don't know if you don't ask.
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I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.