Line a 15cms/6" round cake tin or a 2lb loaf tin with a double layer of greaseproof paper.
Melt the butter, syrup and chocolate in a pan over a low heat. Stir to make sure all the ingredients are well mixed together.
Add the biscuits, maltesers and fruit and nuts, if used. Stir well.
Transfer to prepared tin. Level it on top and press down well to avoid air gaps. Allow to get cold and hard. Wrap completely in greaseproof paper and store in a fridge.
