Hi, The genuine bulbs JWH100070 (black base 2 needed) for cabin temp switch illumination are £8.50 each. JWH100060 (grey base 3 needed) are £3.95 each, LCD panel illumination. Both are T4.7 bulbs so I just used the grey based, cheaper ones instead of the more expensive 'correct' ones but I would be interested if LED ones would be ok.