Hi,
So the Death Star looks to be fairly complete with just one clip missing (these come in two pieces) and the two guns for the top gun part. Also this set came with 5 or 6 clear plastic stands and the instructions. The clear canopy cover is a big plus with this set as one in that condition could cost between 50-100 GBP loose

. There does seemed to be a few tears to it and the the classic rip to the part that folds to make one of the floors and struts (bit hard to explain that part but you normally see this part ripped and mended with tape).
As for price it's hard to say although in this condition and near complete could go for around 150-200 GBP. He's some sold listings to give you an idea of price and also what's in there (look at the instructions) -
http://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=palitoy+death+star&LH_Complete=1&LH_Sold=1&rt=nc
You could also look at completed sales on ebay to see what didn't sale and remember these always go for more with the box in any condition.
The Cantina looks to be nearly all there except the yellow stands (can't remember how many as my one I was bought as a child from my local toy shop had some things missing from it :evil: , maybe 3-4?), the fighting stand (two stands joined together) and instructions. It looks to be in good shape and without a box goes for around 60-90 although I'd probably want it for somewhere around 40. Here's another sold listings for it -
http://www.ebay.co.uk/sch/i.html?_odkw=palitoy+death+star&LH_Complete=1&_from=R40&LH_Sold=1&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR3.TRC2.A0.H0.Xpalitoy+cantina&_nkw=palitoy+cantina&_sacat=0
Just my thoughts but hopefully this will be of some help.
Ian