UK Car Repair: fuel starvation - Rolls Royce Silver Shadow 1977, rolls royce silver shadow, royce silver shadow

Question
My Rolls will start cold with choke with no problems but as she warms up she will not idle and only runs if I manually hold the choke open. I think the choke is compensating for lack of fuel. I have checked fuel pump, fuel filter (main) and fuel filters to both carbretters - all o.k and fuel in good supply. Any suggestions as to what I can try next?

Answer
It would be unusual for this to just start by its-self. How do you manually hold the choke open? (in the engine compartment with a lever of some kind?) The typical faults are too much fuel - a bad float etc. Did this just happen and, you do have SU's dont you?