I don't know if this option is available in the UK, but Autodesk has an introductory offer for Fusion 360 (CAD and CAM) that get's you the full $1200/year package for $300/year, for life.
http://fusion360.autodesk.com/pricing

I've never used it, but I'm seriously considering it.
I had hoped to one day purchaser a full seat of AutoCAD. But, Autodesk is going subscription only next year for all their products, and this is a great deal.