I think we've talked about this previously, Roger, but I never tire of the subject of influences.
The Smothers Brothers were almost unknown in the UK when I was growing up, but as a kid who lived in Germany at the time it was twice as unlikely that I'd hear about them from British sources. Luckily, I went to school with US servicemens kids and they had LPs of the Smothers, of Newhart, of Cosby, and (later) Cheech and Chong, so I got a good grounding on what was coming out of the States.
The two things I most admire about the Smothers is that (a) they never lost sight of their "brand". They still do the famous "take it" sketch today, decades after they did it on b&w TV with new twists, and (b) they had the immense courage to stand up to the right wing political elements, be advocates for liberalism and be edgy. In fact they lost their TV show over their unwillingness to ramp down their criticism of the right wing elements and big business.