I was surprised that your article on royal visits ('Why roll out the red carpet...' cover feature, 8 April) made no reference to a guide to hospital visits called Ceremonial Occasions, produced by North West Thames regional health authority and widely used by trusts. Your own publication included a feature on it when it was produced in the early 1990s.

I should state an interest as a former member of the North West Thames PR team, although I cannot claim any credit for the guide, which was written by my former colleagues.

Rebecca Mosley