KatHasBrokenHerBoatAgain

We're cruising along for about 2 hours very happily in the winter sun, then the engine sounds like it needs the throttle to he pushed more forward to get the same amount of power. It sounds like it's going to cut out, so I pushed the throttle forward which kept us going along for a good half hour more, but the smoke coming from the engine is significant (I assume because at this point we're burning through a lot of diesel). I realise with playing around with the throttle that pulling it back even slightly risks cutting out the engine, so we continued on full power until we found an appropriate mooring spot. Pulled back the throttle slightly and the engine did indeed stop. We've got plenty of diesel, had plenty of oil before setting off, filters were cleaned last week. We're getting a service in two weeks. Should I hold on until the engine service and just travel short distances until then? Or is there anything I can check in the meantime? Thank you!