Chancellors' choice while delivering the Budget statement. Traditionally this is an alcoholic beverage, often whisky or a similar spirit, but in recent times, some Chancellors have opted for mineral water. Dress code Men are expected to wear formal attire, women are expected to dress in business-like clothing and the wearing of T-shirts with slogans is not allowed. Hats must not be worn (although they used to be worn when a point of order was being raised), and Members may not wear military decorations or insignia. Members are not allowed to have their hands in their pocketsAndrew Robathan was heckled by opposing MPs for doing this on 19 December 1994. Other traditions The only animals allowed in the Palace of Westminster are guide dogs. Sniffer dogs and police horses are also allowed on the grounds. Speeches may not be read out during debate in the House of Commons, although notes may be referred to. Similarly, the reading of newspapers is not allowed. Visual aids are discouraged in the chamber. Applause is also not normally allowed in the Commons, but it has since been tolerated in certain cases. Some notable exceptions to this were when Robin Cook gave his resignation speech in 2003; when Prime Minister Tony Blair appeared for the last time at Prime Minister's Questions; when Speaker Michael Martin gave his leaving speech on 17 June 2009; and after the resignation statement of Sir Robert Rogers, Clerk of the House. At the start of the new parliament in May 2015, the large influx of new Scottish National Party MPs flouted the convention and repeatedly applauded their party leader, to the displeasure of the Speaker. The status of the Palace as a royal palace raises legal questionsaccording to Halsbury's Laws of England, it is not possible to arrest a person within the "verges" of the Palace (the Palace itself and its immediate surroundings). However, according to a memorandum by the Clerk of the House of Commons, there is no prohibition on arrest within the Palace and such arrests have been effected in the past. Culture and tourism The exterior of the Palace of Westminsterespecially the Elizabeth Tower which houses the bell known as Big Ben, and its setting on the bank of the River Thames—is recognised worldwide, and is one of the most visited tourist attractions in London. Tsar Nicholas I called it "a dream in stone". The United Nations Educational,