If the MOT is still valid, i'd bung a full can of Forte Diesel treatment in the tank (as little fuel as possible to richen the mix) and then when the roads are quiet take it for a 100+ mile Italian tune up, and then resubmit the car with the engine hot, will cost you about £15 plus the fuel used and another test fee.
If it passes get yourself some Millers Diesel treatment (Diesel ecosport or whatever its called at present) and put in the required amount with every fill up, permanently, this stuff really helps clean up injectors etc.
You've obviously checked the air cleaner isn't hiding a bird's nest?
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