You can buy a set here (and get a 10% discount on the dumbbells & stand with code "StrongHomeGym") stronghomegym.com/recommends/assassin-goods-dumbbells/
The Assassin Goods Stealth Adjustable Dumbbells are perfect in my opinion. Apart from one small thing I would change about them, which I explain in the video...
These are the same product as the Trulap adjustable dumbbells in the USA. In the US, you can get Pepin's or the REPins, which do seem like the best adjustable dumbbells you can overall get as you can drop them (they are more pricey though). But in the UK you really only have the Brain Gains that compete with Assassin Goods (apart from the other alternatives like Powerblocks, Ironmasters or the Bowflex style with the button).
In the video, I explain why the Assassin Goods adjustable dumbbells are my personal top pick.
0:00 The 1st criteria we assess
1:09 Why small is better
2:25 Why quick isn't always a bad thing
3:20 Analyse the mechanics
5:07 The most common negative opinion
5:44 Materials
7:26 Other bits and my opinion