I would like to gift Bitcoin to a minor - how would I do this please?
Since you're posting this in Legal, I'd say discuss it with the kid's parents first.
Just a minimum amount which appears to be 30 UKP.
UK Pound? I've never seen it written like that.
In Bitcoin, there's not really a minimum amount, this sounds like a limitation from an exchange, and depending on the exchange you may waste a lot of money on fees. I take it you're unexperienced in Bitcoin yourself, correct?
For saving, as he is already a keen saver and has said he would like some Bitcoin.
I would be nervous about him dabbling in dealing - are there safeguards to prevent this?
I'd say make it a learning experience for him, and leave it to him what to do with it.
I have also considered putting it in my own name and transferring it to him legally when he hits 18. Is there any way of giving him "read-only" login rights to an account so he can check the value without being able to tinker with anything?
If you give him a watch-only wallet, you're basically giving him nothing and he has to trust you'll give the keys 6 years from now.
The first site it mentions is (now) a scam! Don't recommend it.
I would prefer to gift Bitcoin in a more ta tangible form than paper.
Just for the record: Bitcoin isn't "tangible". You can write/print/stamp the keys on anything you want though.
There are so many ways of transfering Bitcoin, anything from a printed private key to an Electrum seed or funding an address created by your nephew, but it all has pros and cons you should be aware of before using it. But that doesn't really belong in "Legal".