That is very very strange. PLEASE don't get yourself (too) upset about it though Cheryl... it's one of those stupid "the computer says no" moments...
My other half received THREE letters from the UK Inland Revenue (in the same post) on Tuesday. Each one contained his new tax code. Each one was different. I wonder whether it mattered which order he opened them in?!! IDIOTS! (Watchdog did a segment on it... we're not even bothering contacting them cos did that a fortnight ago when we received two and how did that help? We got three... so now FIVE different ones in two weeks! And, worst still, cos we don't pay tax in the UK, YOU GUYS are paying for their stupidity!!