Hi all, small update, now with about 2500kms on it.
Have become obsessed with fine tuning - can't get it totally perfect at 1-2% throttle because very small changes have a major impact on airflow which cause pretty large dynamic changes in AFR, but it's pretty good overall. On the open road trips we've done so far we were getting 23mpg (imperial gallons).
Added a surge tank and lift pump to stop fuel starvation on turns when main tank was low. Works well but I'm hoping the carter rotary vane lift pump fails at some stage so I can replace it with something less noisy!
Under-bonnet temps were pretty high in stop/start and even at steady 100kph did not stabilise below about 40C. Have added a cold air tray and a small front splitter to train flow from the upper grill area up into the tray. Has dropped IAT down by about 10C to 30C, and usefully it takes a much shorter time to flush out a heat-soak condition from sitting in traffic once it is moving.