The average depth of 4K and 8K TVs that were launched in the last year is 64mm. With a depth of only 51.5 millimeters, the 49UH8509 has one of the thinner depths amongst 4K and 8K TVs of this age.
It may also be worth also looking at one of the alternative 51.5mm thick TVs currently available including because of its better review score, the LG 55UH850 (£549.99).
Televisions with a thicker depth that might be worth looking at include the UE49KS9090 (52mm), or the UE65JU6000 (£799.99) (51.4mm) both from Samsung.
What does "depth" mean?