sorry, naomi, I accidently subscribed to a thread once, then couldn't understand why the message kept appearing bottom right of screen. sorry again, I'll blame chi-chi
Some explanation as to why this answer is late here: www.theanswerbank.co.uk/Answerbank-Suggestion
s/Question1156964.html
Short answer is, there is no easy way for me to tell how many. I will ask the techies to find the answer, but as you can understand, they've got bigger jobs than working out statistics.