Thanks for the advice and consolation, have just counted the weeks and my hen started tiring of the chicks and laying again 7 weeks pretty much to the day. I have been letting them free-range for the past 3-4 weeks as she was so protective, she kept them in the garden near the house. I will know next time to stop them free-ranging as soon as the hen starts to lose interest - last night I lost a lovely little hen, they must have followed Opie up the drive and she didn't make sure they were with her when she came back. 3 of them made it back but after 2 hours of searching I found a little pile of white down near the neighbouring farm's gate. Poor little thing, feel terrible, will know next time. RIP little white chicken.
It is brutal, isn't it? They still go cheeping up to their mum and she chases them away quite viciously. They have slightly broody-mad Auntie Goldie who doesn't seem to mind them being about too much but still pecks them away if they try to get in on the food before she's had her fill. That blinking pecking-order is no fun but am sure they will all calm down soon. Glad for this board.