Hi Loz, welcome to the land of chicken keepers , I love mine- had them for a year now, 2 golden line, 1 black sussex and 1 bronze sussex. They will start to lay at about 20 weeks old, Like the others, I feed mine layers, they always have access to this, they use to knock the top off as well so I got an old metal shelf bracket which we attached to the side of the run and I hand the feeder up on that so the feeder tray is just at their head height. water and grit I use the same bowls as above and also a rabbit water bottle. They have the same mixed corn as well - they are given this late pm alone with any thing left from dinner ( not meat ) you must never give them raw potatoes put they love them cooked and any left over veg cooked or raw. They love a cauli when I have cut out the flower for us they get the leaves.
One last thing - they love tinned kidney beans and sweet corn ( this makes their yolks yellow ), but remember they are very fattening and must only be used as a treat,