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'?

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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.