Thank you Admin. That has helped to confirm my train of thought. I will reinstate the hand throttle.
As regards tuning the carbs, yes straight forward. I have a very useful SU manual which I picked up a number of years ago in my Daimler days. It lists the various types and how to strip, refurbish, rebuild and set up single or multiple mountings. If anyone needs this sort of information though it can be easily found on the web.
Thanks again, a hand throttle is another for the to do list.