You can defo do it on the main HL website. From memory the set alert button looks like a little bell shape next to the stock holding.
I now use just the app and can’t find it on there unfortunately.
A quick search on the FCA register will tell you this is kind of true.
He works for first equity. He has transferred them from personal holdings to company holdings probably under a discretionary licence. If I recall he even mentioned on twitter he doing this.
No probs SF2. Love the biggish moves though. Makes me want to unfilter chartist. His head must be spinning and spouting millions of scenarios in the hope one comes true.