The UK's Food Standards Agency has stepped up its health warning about counterfeit vodka contaminated with methanol in the country after another illegal product was been found on sale. Customs and Excise officers seized four cases of S. Petersbourg Vodka from off-licences in the Holloway area of Islington, north London, late in June. More than a dozen bottles of the same vodka were seized from off-licences in the Waltham Forest area of north London in an earlier raid.