Huge lot of 900 commercial world covers, ranging from the 50's to the 90's, maybe an odd one or two outside those dates.

some of the islands but no mainland GB 

Please see the photographs above, of the actual covers you are buying.

I have tried to spread them out a fair bit, though of course there are plenty that are not visible.

Mixed condition, I guess as standard.( some folded, some with wear and tear, etc) They are unchecked by me, the only thing I have made sure of

is that they are whole covers.