21.5", 8 GB RAM
From Amazon
asus AIO A2302 21.5-Inch FHD All-in-One Desktop PC (Intel Pentium Gold 8505, 4GB RAM, 256GB SSD M2 NVMe, Intel UHD Graphics, Windows 11) - Black
John Lewis & Partners
ASUS Vivo A3202 AiO All-in-One Desktop PC, Intel® Pentium® Processor, 4GB RAM, 256GB SSD, 21.45" Full HD, Black