I've looked through the logs and there's been no problems, permissions are all good for people to see the images to I've no idea...
Could be a communication issue from your site Gary to BCUK, for some the images re cached and others not... probably not though.
seems fine for the most part, I've never had a problem and most people haven't and even those that have it seems intermittent.
I completely agree with you on the cost of subscriptions to services etc, it's nuts!!