It's not a problem Ian, I will put a thin bit of something between the two and it will be just fine.
I will be looking to build another one in the future for my daughter, so I'll be in touch soon.
Also I want to build a 4 or 5 nixie tube temperature display, if you know of any kit's for that.
Many thanks for all your help.
well, not exactly, but there's an I2C bus available and the code is out there. I'm not aware of anything that does what you are asking for by default, except "bargraph" type thermometers, which I personally don't go wild about.