Not from what I recall. You may be perhaps more aware of it nowadays, but as far as I can tell politics and politicians have been the same as long as we have a written record of them.

There is a measurable difference in that Ministers who had been found to be lying or "misleading the house" would previously resign; or otherwise if they had proven misconduct; or sometimes even if the appearance of misconduct had occurred. Now they do not. The last vestiges of an (admittedly outdated) honor culture have gone and been replaced by a much more shameless approach to lying.