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Interesting article, jno, thanks, and thanks all for your comments.
When I say haven't used any for couple of weeks, should also add that neither have I been wearing any makeup. Returning to work next week, no doubt I shall start wearing both again (couldn't face foundation on dry unmoisturised skin).
I think we all know deep down that the expensive brands are in some cases an absolute rip-off and don't deliver anything that the cheaper brands do not. I'm a sucker for anything new though "OK, this is the one, I believe all the hype and obviously if it costs in excess of £50 for a teeny little jar then it must be good!"