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Hi the boiler has sooted out you will need to clean the lense of the photocell first and clean the baffles out you should be OK then. If it still smokes after you have cleaned it then back flueway could be restricted but worry about that later
Loads of kerosene where?? if the Bottom is pooling with oil Stop using straight away you need a new solenoid Valve, personally i would change the whole pump.
A block to clean the boiler does not mean the flue gas ways are clear the plumber should also have turned the air up on the boiler to aid the burning process once its burned out he should have pulled out all the baffles and resetthe emissions using an analyser and smoke tester