from mpl_toolkits.basemap import Basemap
import numpy as np
import matplotlib.pyplot as plt
# llcrnrlat,llcrnrlon,urcrnrlat,urcrnrlon
# are the lat/lon values of the lower left and upper right corners
# of the map.
# resolution = 'i' means use intermediate resolution coastlines.
# lon_0, lat_0 are the central longitude and latitude of the projection.
m = Basemap(llcrnrlon=-10.5,llcrnrlat=49.5,urcrnrlon=3.5,urcrnrlat=59.5,
            resolution='i',projection='tmerc',lon_0=-4.36,lat_0=54.7)
# can get the identical map this way (by specifying width and
# height instead of lat/lon corners)
#m = Basemap(width=894887,height=1116766,\
#            resolution='i',projection='tmerc',lon_0=-4.36,lat_0=54.7)
m.drawcoastlines()
m.fillcontinents(color='coral',lake_color='aqua')
# draw parallels and meridians.
m.drawparallels(np.arange(-40,61.,2.))
m.drawmeridians(np.arange(-20.,21.,2.))
m.drawmapboundary(fill_color='aqua') 
plt.title("Transverse Mercator Projection")
plt.show()