Not quite doable, if you want decent, this is closest you can get, 265, also it means using stock HSF
Powercolor ATI Radeon HD 4830 512MB GDDR3 TV-Out/Dual DVI/HDMI (PCI-Express) - Retail (AX4830512MD3-H) £95.44 (£82.99)
Asus P5QL-EM Intel G43 Micro-ATX (Socket 775) PCI-Express DDR2 Motherboard £78.19 (£67.99)
Intel Pentium Dual-Core E5200 "LGA775 Core 2" 2.50GHz (800FSB) - Retail £62.09 (£53.99)
OCZ 2GB (2x1GB) PC2-6400C4 Dual Channel Platinum Revision 2 XTC Series DDR2 (OCZ2P800R22GK) £19.54 (£16.99)
Sub Total : £221.96
Shipping cost assumes delivery to UK Mainland with:
DHL @ Home Next Day (Delivered Mon-Fri)
(This can be changed during checkout) Shipping : £8.49
VAT is being charged at 15% VAT : £34.57
Total : £265.02