Missing consonant

Spot the missing consonant in the sentence I have just sent out to a client:

We will need to arrange for temporary hoaring in front of the shop window.

This reminded me of my favourite office typo that was sent out to a client when I worked in York a few years ago. Our secretary, bless her, didn't seem to use much common sense, and had trouble reading our bosses handwriting. Instead of writing to our client called Mr O'Shaughnessy, she wrote to Mr Shag nasty.

I've been tittering about that for years.