I asked Valspar at my local B&Q to colour match F&B Strong White. Got a test pot, happy with the colour so went back to B&Q (different store as visiting family) and asked them to make up 5L. I showed them the test pot, so they had the exact formula, but when it came out it was dark brown! They pointed this out and made up another 5L to their own formula. Now that I've got it home, it's different again. Weirdly pink.
My local store won't take it back as they didn't mix it and the other one is 40mile round trip. Do you think I've got any comeback? I understand they can't guarantee an exact match to other brands but I'm out 5L of paint because they can't match their own flipping test pot!