The tick over or idle of the Rover had been lumpy for some time and setting the carbs didn't seem to help. I went through the ignition replacing and repairing but no real difference.
The fuel consumption was pretty horrendous and the car would tick over albeit it a bit more lumpy even when cold without choke.
I pulled out the starter valves.these act as a choke on HIF6 carbs letting through a rich mixture. One was pretty worn but on one carb the O ring had broken up completely. I replaced both and although I still have to reset the carbs the V8 now idles slowly without trying to cut out or foul its plugs.