I did the door striker thing, it worked for a little bit on the passenger door but seems to have returned to 'normal' now (i.e if the door isn't locked when driving it may well fly open while moving!) Nontheless it is better than before.

I can say without a doubt that taking the trim off and just caking the mechanism in lube doesn't do anything (i didn't remove any of the old grease crap just sprayed over it).

Moving the strikers in helped me with all the other doors just not the passenger one.

Will eventually get around to taking off all the old lube crap and making it a maintenance item!