This came up via Twitter debate, seems hopeful use on bracken may yet be able to continue
Does anyone know anything about the mentioned 'alternatives'?

North York Moors National Parkon 10/10/2013 at 11:47 said:
The EU withdrawal of the licence for the chemical Asulam came into force in 2011, with a use-up period for existing stocks up to December 2012. This ban was largely a response to concerns over its use in Europe on food crops – in the UK Asulam is principally used to control bracken in upland areas. A national stakeholder group, The Bracken Control Group, has been campaigning to have the chemical re-licenced specifically for bracken control in the UK. Earlier this year an Emergency Licence was issued to allow the use of Asulam for bracken control in 2013 and a further Emergency Licence has been granted for 2014. There are hopes that the chemical may be fully re-licenced in due course, but the Bracken Control Group are also involved in trials of alternative chemicals which may be licenced to replace Asulam in a few years’ time.