These are extremely common shelving units, I have several around the house.
Be aware that there are two kinds, the heavier ones are the ones you look for, and the lighter ones are cheaper but are more liable to shake. The heavier ones are strong enough to stand on (not recommended though, not a stool).
On the U.K. Amazon website:
https://www.amazon.co.uk/Amazon-Basics-Storage-Adjustable-Levelling/dp/B01M0XLTT5
They are available in lots of combinations. You assemble them and they can interconnect with other sets of the same type. There are many different widths, heights, and shelving numbers available. You choose the heights of all shelves as they latch to indents up the length of the poles. Taller units are usually made from two or three poles screwed together.
I have turned tall shelving units into two shorter side-by-side units. I used to have a 32" CRT TV (very heavy) on a large one that now has a couple of Apple Macs and screens with storage underneath.
I have noticed almost every TV kitchen (home and professional) has one or more.
Make sure you find one with the correct width. They tend to sell these in two shelve orientations; edges up and edges down. You want one with the edges down, edges up is for things like kitchen items you do not wish to fall off the shelves.