I have about 0.5Ha of bracken and have heard all the stories about hitting it with a stick, cutting it twice a year for 10 years etc. None of them work, so I intend to try Asulam (generic name Asulox). Pitchcare.com are offering 'Asulox 5L' at £75+VAT, and say that the application rate is 5-10 litres per Ha (200mls/20litres). I assume this means that £86.25 buys 5 litres of concentrate which is diluted 1:100.