Which? (Consumer's association) did a survey in November 2002 (quote):
"Easily the best cultivator on test was the Rally FT5. It performed well and was popular with our testers. It was well balanced and, thanks to the simple controls, was easy to use. The adjustable rear wheels and anchor tine gave a range of available digging depths and also meant it was easy to manoeuvre on both hard and soft surfaces. The Rally FT5 costs around £500 and comes with a one-year guarantee. Contact Rally for stockists."
I checked on
http://www.froogle.co.uk and they are cheaper now ;D ;D.
Good luck! I'll think of you when I'm hacking back the undergrowth by hand ::)