In reply to Bootsy:
Thank you all for taking the time to reply.
GwilymR / Ridge - yup, something a bit more utilitarian had crossed my mind. I guess this has the advantage of being fully flexible...and cheap!
Marsbar - I'm a great fan of eBay, but I guess I was wondering what others had done specifically that had worked for them. If it's on eBay it suggests someone might want rid of it because it hasn't! Perhaps I could look for 'inspiration' there since I am certain I am not the first to have had the same requirement.
JLS - I did see the Raxa ones in B&Q and wondered about them. Reassuring to hear they they are as sturdy as they claim to be. I had thought perhaps teaming them up with some plastic storage boxes might be the way to go.
If there are any others out there with bright ideas that fit the remit above then I would be interested to hear them.
Cheers