A TOTAL ban on visitors to the House of Commons is being demanded by some MPs after protesters infiltrated its VIP gallery yesterday and one threw flour bombs which struck Tony Blair. In the biggest Westminster security lapse since the 1979 assassination of Airey Neave, protesters managed to obtain tickets for front-row seats which placed them within striking distance of the Prime Minister. Although they only stained Mr Blair’s jacket with purple flour, their tactics mirrored that of a potential biochemical attack which the Prime Minister’s officials consider the greatest threat to his life. Mr Blair was jousting with Michael...