I switched to Kritterkill Professional Roban Rat/Mouse which I bought from an Ebay seller. It came in an unlabelled bag, which I thought was rather dogdy. Presumably the seller had bought it in bulk and repackaged it themselves. Anyway it worked!
Before that I'd used Rentokil PSR98 ratkiller which didn't work at all.
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I switched to Kritterkill Professional Roban Rat/Mouse which I bought from an Ebay seller. It came in an unlabelled bag, which I thought was rather dogdy. Presumably the seller had bought it in bulk and repackaged it themselves. Anyway it worked!
Before that I'd used Rentokil PSR98 ratkiller which didn't work at all.