Paint issues BRG monaco

I’m trying to get the correct paint for my mx5 Monaco. Went into halfords knowing its British racing green code HU. However halfords don’t stock it and when they mixed me a free sample and they came out with the colour neon green and it’s a few shades too light. So now I’m trying to see of they made a mistake or if I can use a British racing green from another manufacturer. Any help or advice or where people have bought paint from before much appreciated. I only need a small rattle can for touch ups.

 I used to have a BRG Mk1 - Halfords were hit and miss - 1st can was Neo so no good but the 2nd was HU when they mixed it and it was a good match - so maybe best to look over their shoulder when they are on the mix counter pc.  Other independant motor factors with the colour kit should be able to do it too. I tried a Mazda dealers and they just laughed at me when I asked for a tin of paint…Good Luck

Try www.paints4u.com