The Killermetre: The 5K & 10K with “The Timed Killermetre” twist! Run The Berkshire 5K or 10K Killermetre and take on the Valley of the Racehorse. From The Jockey Club Estates, Mandown Gallops, Lambourn run or race on the training ground of Grand National winners. Experience the magnificent gallops of the undulating Berkshire Downs before reaching The Killermetre challenge: a timed 1 KM section to the finish. The Berkshire Killermetre is raising sponsorship via corporate donations and awareness for the Injured Jockeys Fund.