QNAP TS-431X-2G 12 TB (4 x 3 TB WD RED) 4 Bay Desktop NAS with 2 GB RAM (GDPR Compliant)

Price range: £654.02 through £2,121.98

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10GbE readiness, SSD caching. and hardware-accelerated encryption
Enjoy containerized virtualization and IoT app development with Container Station

Synology 2GB DS418 4 Bay Desktop NAS Enclosure

Price range: £395.96 through £1,512.95

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Powerful 4-bay NAS for offices and home users
Sequential throughput performance at over 226 MB/s reading and 170 MB/s writing