A quick run down to the recycling bin to retrieve the 'flyers' that have been delivered recently with garden tool adverts. Debroussailleuses are what you are looking for. They also come in debroussailleuses a roues (apologies for the lack of accents - I can manage the euro sign....) which are like a lawn mower but with a big blade underneath that hacks its way through brambles. We were surrounded by undergrowth and optimistically attacked it with a petrol strimmer - soon went down to the shops for the thing with wheels! Best of luck! Pat