HP Compaq ultra slim desktop PCs are the typical kit found in corporate environments and are often replaced on regular schedules.
This means they are easily available in the used market. Rather than buying the latest model at £500-£1000 why not have a previously used system upgraded to Windows 10 and a Hybrid or SSD hard-disk replacement – which makes them very snappy to boot and run programs. They are very neat as they are based on laptop components and can sit under your monitor or hidden away more easily than the common form factors like tower PCs.
Typical Inclusive cost: £ 250 – 350
Subject to availability