there was an irishman/welshman/scotsman and englishman who had been chummin up for quite some time when the englishman says " we've been gettin on quite well heh lads, we should form a club OK?" so the all said OK OK OK. So the englishman said " OK we've got a K then lets keep it short [you can see whats comin can't ya?] - but we could be all day pickin another out of either 18/29/18 - 25 letters - how about I just pick one other and the three other dying for a drink shouted OK - " good said the pommie we've got the U and a unanimous K - we'll call it UK for short - "great said the other three now lets get down the pub and celebrate" and thus it has been so ever since?? - OK I'll get me coat and hat !!