Thanks LIz!
Actually, my MIL also suggested it may be teething when I spoke to her today! Now that I think about it DD has been off her food (spits out lumps of food that she would usually eat happily straight away and will only eat yoghurt) and is unusually grizzly. Wish I'd put all the clues together earlier! She got her front 8 teeth with no trouble so these may be the nasty molars I guess.I put Bonjela on her gums before bed tonight so will see if tonight's any different. Poor things, teething must be really painful to affect them like this! She's like a different person!

Clare