Have a look in the bargain cars section of Auto Trader and your local free adds papers. The web stuff is usually out of this price range but there are plenty of bargains to be had. Local shops and super market notice boards are also worth a try. You must have a local rag of some kind that has classifieds in it? High mileage is good value but watch running gear, bearings, ball joints, steering rack, brakes etc. Modern diesel engines if well serviced are easily capable of 200,000+ mls but the rest of the vehicle isn't routinely serviced so tends to suffer. However if you reasonably handy most jobs are doable. Good luck.