PCPartPicker part list:
http://uk.pcpartpicker.com/p/G68Rt6
Price breakdown by merchant: http://uk.pcpartpicker.com/p/G68Rt6/by_merchant/
CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor (£51.54 @ Scan.co.uk)
Motherboard: ASRock Z97M Anniversary Micro ATX LGA1150 Motherboard (£62.22 @ Ebuyer)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory (£34.58 @ Ebuyer)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£32.40 @ Aria PC)
Video Card: Asus Radeon R9 270 2GB DirectCU II Video Card (£119.98 @ Dabs)
Case: Cooler Master N200 MicroATX Mid Tower Case (£28.17 @ Amazon UK)
Power Supply: Antec TruePower Classic 550W 80+ Gold Certified ATX Power Supply (£51.93 @ Dabs)
Total: £380.82
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-08-06 01:42 BST+0100
How does that look? You could go for the MSI P33 motherboard which is about £20 cheaper but lakes a lot of features and also with the pentium you can get overclocks on this and in the future you can get an unlocked i5 or i7. I uped the psu and gpu.
If you want to use the original build then definitly change cpu to the athlon 860k.
Also what exactly do you want out of this pc for it's use.