Thank you both for your quick replies. I have had a look at it and I think I had misunderstood how it works with regard to being active/off and then selecting temperatures to actually make it start to heat the hot end. I have played around with the config file and it works as you describe by commenting out the T0. I initially thought you were talking about in the heater definitions, but I found it at the end of the config file.
Thank you for your help