Jerky slow-speed performance on my 1.4 Tdci was cleared after an MOT when the emission test blew the seat out of one of the injectors and the garage had to re-seat all the injectors. They found that the inlet manifold was heavily coked showing that the injector may have been leaking for some time. But - first try adding a dose of a good diesel additive - Miller's Diesel Eco-Max or Uniteddiesel.co.uk 's Diesel Rhino. That may, if you're lucky, clear the problem if it's being caused by a mucky injector, but if there is just a slight improvement, then that may point to you needing to replace injector seals. I'm tending towards an injector problem due to the absence of a fault code. (But I'm no trained mechanic! Just going off my own experience with this engine).

Is the tick-over steady or a bit hesitant? A steady tick-over sort of rules out the injectors.