Thanks for those ideas!
I had a look at Preloved but there was nothing I really fancied.
Like you we've had a bad experience, we bought a batch from someone near Sevenoaks which looked fine however they were carriers of something and before long all our other chickens has died - ironically the fox got the last one of the 'carriers'.
This batch have been truly fab, great looking and great layers. I don't mind something other than Light Sussex. Will try the place in Malling and see what they have.