How do I adust the alignment on a 1995 (M reg) Honda Accord Aerodeck Estate. It has failed its MOT for nearside headlight aiming too low. I can't find any adjusment mechanism.

Look along the upper radiator support (the bar that connects from fender to fender).
Look into the small holes along the top. You'll be looking for a small screw head that is in the hole. Some are marked with either a "V" or an "H". V for vertical and H for horizontal.
With the car parked facing a flat wall about three car lengths away, turn on the lamps and turn the screw to move the offending lamp to match the other side. Hopefully, that will be enough to pass your inspection.

Thanks for trying to help and apologies for the delay but no adjusters on top bar garage eventually managed to reset light with help of a honda dealer. There must be some peculiarities with this model as ABS diagnostic link up couldn't be found either even by the honda dealer - visual checks had to be carried out manually for components until fault was found . One of the sensors.