I got selected to do a take home task which took hours and hours of my time. The feedback I got was that it wasn't simple enough. The fact that it took hours of my time and they wanted a solution with all bells and whistles (unit testing, documentation, CI/CD pipeline) tells me that John Lewis don't value the candidates time and expects free work from them. Furthermore, even though they asked for a simple solution, the code themselves they provide is needlessly complex, I don't who they are trying to impress by doing that. The fact that despite the amount of effort I put in, I didn't even get an interview says something about John Lewis, they want cheap labour and hire cheap candidates. I avoid them, especially if you are looking to enter a more technical role.