Yep I know. I'm always telling my father all this!!
Thanks all for the replies
Your 'other half', 'Mr Cat' is also your father?! What is it with the female members of UKP this Christmas?
Back to topic. After making bookings on AW and having to enter my number into the confirmation form, it has then been automatically transferred to my profile. (Perhaps this also happens if number used for verification or other reasons?) Now I always remember to clear it straight away. I believe it was either used by the site themselves or because client connections was active - so a third party searching for numbers. I then had unsolicited texts trying to instigate sexting or inviting me to watch porn. I ignored all, but my bill later showed £1.50 charge per text.
I rang Vodafone and they revealed them to be 'adult subscription services' and after explaining that I hadn't ever signed up, had the charges refunded. Also, at no cost to me, a premium text blocker applied to my number. This means I can't enter competitions on telly by text too, but no loss there.
So best to ignore but check with billing company too.
I later Googled the numbers and some had been mentioned in forums for phone scams.