def get_data_file_parameters(data_type):
    """Takes a string describing the type of climate data, returns url and file name for that data"""
    
    base_url = 'http://www.metoffice.gov.uk/climate/uk/datasets/{0}/ranked/UK.txt'
    data_url = base_url.format(data_type)
    data_target = 'UK_{0}_data.txt'.format(data_type)
    return data_url, data_target