I've finally got round to purchasing and using a baby shampoo and conditioner. I'd been a little embarrassed about going into a shop and buying the stuff so I persuaded my wife to get it. It was my hairdresser who first suggested this and the response to an earlier post finally persuaded me I had to do something about it - so thank you, Laura! No obvious reactions or burning of the skin - as I had from Imperial Leather - but my left eye is a little sore again today. That could be from the glass of whisky I had over the weekend. I'm still not sure about whisky.
I still need to get my glasses out to read the ingredients on the shampoo. The conditioner seems okay - apart from various gums and cellulose additives, which I have wondered about before.