Mini-itx build (the previous one was micro-atx)
£16.28: ASUS DRW-24D5MT - internal 24X DVD burner (ebay: computertechnologylimited)
£26.39: RAM CT8G4DFS824A (CL=17, SR, 8gb, Unbuffered, NON-ECC, DDR4-2400) on uk.crucial.com
£57.40: PSU Seasonic SSP-450RT 450w 80+ gold (150 mm (W) x 86 mm (H) x 140 mm (L)) (ebay:
ehrer_hardwareshop from Germany)
£78.17: elite 110 RC-110-KKN2 case Mini-ITX, atx psu up to 180mm in length (amazon)
£97.98: Aorus B450 I AORUS PRO WIFI (Mini-ITX - 2 hdmi, 1 display port) (amazon)
£110.84: AMD RYZEN 5 3400G (ebay: tecno-soluzion from spain; he accepts offers)
£119.99: windows 10 home (from microsoft.com)
Total: £507.05 (or less)
Both builds can run WoW: they meet the minimum system requirements.
For recommended ones, he could also buy a dedicated gpu.
elite 110 size: 26 x 20.8 x 28 (cm)