Confirmed: 300 chr absolute limit on query length, but 100 between brackets. so, use 3 sets of brackets, with <100 in each, then you can get round the 100 chr limit. I use one set of brackets for dates, once for denoms, and one for words, like this -(1967,1972,1977,1981,2012) -(20p,50p,£1,£2,£5) -(commemorative,cover,decimal,Diana,doubles,festival,jersey,gold,man,mother,pounds,proof,token) then you can go up to 300.