Thanks both for your thoughts and input- much appreciated, especially;y the warning re Marklin C - hasn't realised that. I had done the same design using Marklin C, Fleischmann Profi, and Peco Set track with some Streamline (Flexible). In order of preference but was Fleischmann, Peco then Marklin, so I guess I will be using Peco.
Can I just ask, it is Ok to mix Peco set track with Streamline - the layout needed some flexible track?
Thanks again