Best wsy to buy £100 Bitcoin stress free?

Hi all. Sold all my Bitcoin in 2022 and made a decent bit of cash. I was having a bad few months and needed some quick cash, and my investment had doubled so I got out. Im back on my feet now, and would just like to get £100 of bitcoin for now, and then potentially add a little more every payday just to get back in the game. I used to love keeping a eye on the bitcoin price, which was always fun too. So where can I buy this small amount hassle free, and zero risk? Who are you guys using these days?