You might find this of interest if you have a bracken problem -
http://www.thescottishfarmer.co.uk/news/14666687.B...
I had thought of getting a bracken part together for a couple of specific areas in GF, but perhaps this machine might be of use! Though the areas are relatively small and mostly chest high and not too bad to get through so aren't on a par with Perthshire/Borders bracken.