Warsaw is the pound-stretching place for culture vultures planning an autumn break
Polish capital is cheapest of 17 culture capitals
Top notch arts attractions are a deciding factor for half of city break holidaymakers
Performance and gallery prices are down in 7 cities including London and New York
New York remains most expensive – but prices have dropped 38 per cent
Culture vultures who want to save hundreds of pounds on the cost of a high brow city break should