I only give GM free pellets, 2 litres a day (small buckets) shared by 25 birds, then they get wheat ad lib and free range. Spillers are still GM free. Pellets ad lib can give them kidney issues as they are very high in protein.

Please do educate us to what is meant by "very high in protein"
Please do educate us to the direction you receive your information regarding kidney issues related to layers pellets.
"Spillers are still GM free" Please do educate us to where this information comes from (in order that I can pass this information onto the head of marketing) as in no way do Spiller uk intend to cause assumption that all their feeds are GM free, Spillers uk do try to offer a range of GM free products across the supply line in order to meet individual requirements.
Your wheat is it spelt or not, milled or unmilled, rolled or not IS IT GM FREE ? do you have a certificate ? what are the benefits of GM free above contaminated wheat ?
What is the protein level of your wheat at feed time ?
What is the protein level of the "very high level layers pellets"
What is the optimum protein requirement of your hens?
What are the implications of increased protein levels ?
I KNOW THE ANSWERS TO THESE QUESTIONS
1. I am asking so that you can either educate other forum users or a debate will occur
2. To establish whether your research is relevant
3. To establish whether your post is fact or opinion
Sorry if you take offence at my response.