Paint Colour adjustment

[jolies1]

I was a cheapskate and did the B&Q colour match for some paint… it’s turned out a lot more grey than the pale blue - grey I was after (F&B borrowed light). Has anyone managed to tweak paint to get a better tone? The lovely assistant at the shop said you can try pigment?

Mixing pigment into paint is really hard. Think of that massive shaker they put it on to mix everything. It's not something I'd try at home. Or is the shop offering to do it? In which case I'd say there is very little to loose if you don't want the current colour.

Is that just how it looks in the tin? Paint changes when it's dried on.
If it looked markedly different in the shop, could you have refused it?
Frustrating OP!

Maybe use it for the bottom coats and use the proper stuff as the top coat?

Blue is so difficult to get right.

I find blues always get a lot bluer once on the wall. A little patch looks grey,a whole room is intensely blue.. So I'd be tempted to try it, and call it an undercoat if its still too grey

This is right. You absolutely can't tell until it's on the wall and a subtle blue in the tin could be quite a lot bluer when it's up.
Did you decide what to do @jolies1