no the level/fill plug will be an allen key hex to remove (or they were on the Escorts with the IB5 box) and (again with escorts as i saw so many) they were, when viewed from the fromnt of the car, to the right (ie towards the left ffront wheel) of the reverse light switch, and were a little awkward to undo with some tools as part of the front gearbox mounted engine mount got in the way, from memory (its been a VERY long time since ive seen one now)
the original Puma used an IB5 box so should be similar. the wire goes to the reverse light switch, the hex key thing to the right as we look at it (black coloured bung) at a similar level to the rev. light switch is the filler plug (theres an arrow pointing at it in this pic, borrowed from another website) from memory they should be just a tad below that level. we used to 'dip' the opil with the end of a cable tie (i used to keep offcuts for this very purpose back in the day when people used to cable tie wheeltrims on etc)