I found a nice font (actually a few) but, for my coding skills they're not really usable.
I want to be able to, effectively, do
bigLcd.print(tempC,2);
bigLcd.print((char)223); // nice but optional
bigLcd.print ('C'); // nice but optional
within the sketch to display a temperature reading. Everything I've found so far takes individual numbers, breaks them up into bytes and calls them that way (as far as I can tell) and that's just way too complicated for me to fathom out - that's why I was looking for a library.