I know .... yet another foundation thread - sorry!
However, genuinely interested to see whether there are a selection of foundations which work well for those of us in our 40's?
I'm using By Terry Cover Expert just now. It worked for me until they added SPF and the shades changed. I replaced with what By Terry said was the closest match to what I was using (ie one shade down) but it's just not the right and has a distinct orange tone. Tried Dior Star and was colour matched with their device in Debenhams - but daylight showed a real tideline and total mismatch between that and my skin tone.
So I'm on the hunt again!