Pete, no you do not need any more as your boosting fine from here.
Al, clean out your pipes with Domestos and Horlicks. If that fails then turn the battery upside down, point the car towards Mecca and shove a porcupine up the cars exhaust. This scientific technique is recognised world wide to cure all nasty goin strains.
Does my car have a factory fitted fish tank or was that the Euro import and what happens if i fill the tank with bleach?
These questions must be answered now or i shoot the gerbil