I havent been to the famous Hillier winter gardens but I thought it would be useful to share experience and knowledge of flowers/veg in the garden from November to December. I'm thinking of hardy plants (ie not greenhouse, or indoors,or under cloches)
As a start
Winter jasmine (never fails)
Winter honeysuckle Lonicera x purpussi 'winter beauty' (I havent grown this)
Clematis 'jingle bells' (hasnt flowered yet in my garden)
Mahonia (lovely colour)
Snowdrops (essential)
Hellebores (brilliant)
Hesperanthus (beautiful)