Now adjusted up-easy with advice from welung666 over the phone. Went to MOT station to use light tester, 4mm allen key on outer side adjusters, pulled them up lots and now my Mig has correct lights, checked by MOT tester, plus all bulbs replaced with +90% superbrights (H1 Philips Xtremes and H7 Osram Nightbreakers)-so properly set up and with the best legal bulbs.
Note: thought the adjusters were broken, but they are very low geared-took 30+turns to move them a few mm.
Lights now much better, but projector lights are a bad design giving patchy light with dark spots and a rainbow tinged far-end limit which is very defined and does not gently fade out making your eyes aches with the difference between the lit field and pitch black unlit field.
I am amazed that even though the headlight bulbs stay lit when the main beam come on giving 4 lights on at once, that they are STILL not as good as the clear lens large multi reflector units with single H4s in my little hatchback...
I have never owned a "glass ball" projector light equipped car that has been any good in the dark.....
Still at least it is much more driveable in the dark now with 4 superbright +90% bulbs in-but I can make much faster night progress in my 1 litre hatchback which has better designed lights.
Out of interest, I fitted Halfords Super Brilliance* +90s H4s to my Parent's Perodua Myvi (like a Daihatsu Sirion) which has big clear lens multi-reflector lights-this is a WORLD better than the Omega as it is like turning the day back on-with perfectly balanced light, no dark spots and gentle fade-out at the edge of lit field. Better than any Xenon equipped car I have used, too.

Have used most premium bulbs, Halfords used to be best-now quality is inconsistent. Just sent a pair of Osram Nightbreakers back as the filaments dropped out in one week. Philips Xtremes are the very best, but expensive.