Ah now Nigel my dear what he said was number 18 was bothering him :) what he didnt say was that numbers 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19 and 20 were also giving him a bit of trouble.
* grabs walking stick and ear plugs and heads for under the table
"Move over Ashoka"