The closest I've come to actual takeaway doner kebab meat is King Kebab which is available from Iceland here in the UK (
https://www.iceland.co.uk/p/king-kebab-house-doner-kebab-meat-350g/91174.html). It's very close but a little under spiced compared to the real thing and not quite lamby enough because lamb's not the main ingredient. Never heard of chicken doner when I used to get takeaway but that was nigh on 30 years ago now. None of that white-sauce crap either, only blisteringly hot chilli sauce. What a joy that was after a skinfull.
Talking about a lamb doner kebab recipe in general though there are a couple of things that it must have to compare to takeaway meat. First it has to have lamb fat from around the kidneys. And second it will have chicken in it but probably as the lesser ingredient after lamb or possibly mutton.
I was trying to find a recipe that matched the takeaway but then I came across the King Kebab from Iceland and that basically put an end to my search. The red chilli sauce is another story. I tried a few from youtube and they didn't really come close. In the end I settled on Doritos hot salsa which while not being a perfect substitute is pretty close. I blend it a bit to take the chunks out and add Encona original hot pepper sauce to get the heat right.
Between the King Kebab meat an the Dorito/Encona chilli sauce it's pretty darn close to what I used to get from the takeaway.