I got about 3K in charges back from my bank last year ( coz i threatend them with court action ) and went to town on Discogs, spent about 2k in 2 months on there just buying up all the old tunes i ever wanted.
Anyhow, have only had 1 or 2 dodgy transactions on there and if you have ordered summin try and make sure they accept paypal before you order as at least if somethin does not turn up you can get your money back.
Discogs for me is the best thing i have ever found that relates to DnB in terms of you can pretty much get what ever tune you want, and if not you can put it in your watchlist and get email updates if one comes up for sale
Ian, if you look at your email and follow the links in them it will more often than not tell you postage costs and a paypal address in the sellers details, even a phone number sometimes, i just read them, send the money over with the discogs order ref in the title and jobs a good un. ( keep all the emails in a seperate inbox till you have the record....i.e. make a discogs folder if your ordering alot.
People at work used to cuss me as id have an endless stream of tunes coming daily for about a month, ive had them from Japan and Austraila, even Brazil but if you gotta have em you gotta have em eh!!
Dont stress about them not getting back to you , they will soon enough and dont forget some people go on holiday as well, this is sometimes updated on thier page if you have a look at the seller information
Peace