n: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
        }).addTo(map);

        var layer = L.markerClusterGroup();
        var features = L.deflate({minSize: 20, markerLayer: layer});
        features.addTo(map);

        L.polygon([
            [51.551088, -0.144624],
            [51.550818, -0.143648],
            [51.550701, -0.143718],
            [51.550351, -0.142398],
            [51.550861, -0.142060],
            [51.551155, -0.143160],
            [51.551091, -0.1432