def guidance_UV(index):
    """Return Met Office guidance regarding UV exposure based on UV index"""
    if 0 < index < 3:
        guidance = "Low exposure. No protection required. You can safely stay outside"
    elif 2 < index < 6:
        guidance = "Moderate exposure. Seek shade during midday hours, cover up and wear sunscreen"
    elif 5 < index < 8:
        guidance = "High exposure. Seek shade during midday hours, cover up and wear sunscreen"
    elif 7 < index < 11:
        guidance = "Very high. Avoid being outside during midday hours. Shirt, sunscreen and hat are essential"
    elif index > 10:
        guidance = "Extreme. Avoid being outside during midday hours. Shirt, sunscreen and hat essential."
    else:
        guidance = None
    return guidance