Thanks guys, I guess that advice translates as "RTFM!" However, I note that the specific ID seems to relate to a line rather than to a single line point. When I add these in and write my joins accordingly, the problem is not resolved, the output merely becomes differently wrong. Experience would suggest that a line, somewhere is the wrong way round, but I've checked them all, to no avail. Is there a way of attributing an ID to a line point rather than a whole line? Or am I still missing something basic. Graham -- graham.mullan@coly.org.uk In the UK 0117 9502556 or 07887 637064 France from the UK 0844 2327803 In France 05 53 51 19 15 or 06 02 53 37 81