Understanding Society User Support

​Hi, 

I am currently looking at political engagement in Scotland. Understanding Society waves 3 and 6 provide some interesting data on this topic. 

I have read the technical document and as the sampling procedure is seperate for each nation in the UK and the guides say it is representative nationally; does this mean the Scottish subsample is a representative population of Scotland? 

I am also wondering if I am correct to use the individual main interview weights : indinub_xw for my analysis of each wave? And if I were to look at longitudinal analysis the weight to use is; indpxus_lw?

Much appreciated,
Matthew