Yes, I've bought from them fairly regularly over several years - stamos, cigarette cards, postcards. I imagine the lack of images reflects lack of time - but pretty common for GB auction sites. Buyer's premium is always nasty, but I suspect that it pretty much keeps many auctions going in the
ebay world. If I were overseas, with all of the additional costs that carries, I'd need to be pretty sure or buying pretty cheaply.
Abbreviations? The common stamp ones (UM = unmounted mint, M = mounted mint, Unused = uncancelled, but no gum), plus B = box(es), V = volume(s), L = leaves. But there are probably others.
Geoff