Of course, this is not a cheap option.
The most entry-level configuration, the Quiet PC A30 Fanless i17, offers the Cooler Master Masterbox Q300L chassis and processors from the 12th Gen Pentium G7400T 35W to the Core i9-12900 65W.
The standard cooling option consists of a Nofan CR-80EH fanless CPU cooler with a spiral design and heat pipes. For additional money, you can install a more universal solution.
The power supply is also fanless. The PC starts at £907. There are other more expensive configurations. The most expensive can accommodate a 12th generation Intel Alder Lake Core i9 processor and an NVIDIA GeForce RTX 3070 graphics card.