Henrietta Lovell of rareteacompany.com upsets the wartime orthodoxy, to which most of us cling, by insisting that good tea does not need to be made with boiling water. Only cheap industrial tea, as available, for example, in WW2, needs to be.
Mrs Beeton (1907 edition) insists on boiling water, but says nothing about warming the pot.
Another (more credible) challenge to orthodoxy is to add warm instead of cold milk. Some say that the flavour is better preserved that way.