Whenever I've gone looking for Tabletop Gaming in WHS, it's generally not there, but there are copies of at least three different wargaming miniatures magazines. I've yet to work out whether this means TTG is popular and sells out quickly, or toy soldiers are popular so they keep more mags in stock.
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Like you say you often go in there and stuff is never to be found or the alternative I’ve bought tabletop gaming in Waterstones before, big pile of them