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Knock the brush down with a brush cutter and then just keep mowing it. Nothing but grass can survive consistent mowing, not even bracken.
Aha! Peening! On my 2 day scything course we were taught peening, either on a curved anvil (very small solid metal block, blade slowly passed over it while hammering, skill and experience needed) or on a "peening jig", a sort of small simple three part jig that needs less skill, flat anvil, the one I bought. It can be looked up on line and even I can do it. But so far my scythe has been sharpened by a wet stone dragged across it over the last few months, so apart from the supervision and training on the course, I have not yet needed to use the peening jig.I do have a slasher/machete, but I am not efficient at using it, yet. At 70 I am very much into slow and careful.I have met goats in Oman where they ate all the vegetation I was employed to illustrate for a book about plant foods used by nomadic tribes in the deserts. Apparently even the Mediterranean landscape was heavily wooded before goats were introduced. So I do believe that goats would be as good as strimmers and scythes in cutting down vegetation.I also have two ancient and rusty sickles which I was told would not submit to peening. I have to find someone with a rotating stone. Frustratingly I noticed one of these on a recent visit to Caithness (Wick) but i didn't have my sickles with me........So if anyone knows a stone sharpener for old sickles within East Sussex or Kent I would be very glad to meet them.