Coolant for 51 plate 156
First post and already asking a question I'm afraid.
I have a 51 plate 156 1.8 that has always had red coolant in it. Now it desperately needs to be topped up but Halfords in-store guide suggests their blue one. I've always understood that you shouldn't mix colours, but Halfords red coolant is an OAT one.
Can anyone recommend which (brand/version) coolant to use? I have a Halfords right next to me so if it is one they sell, that'd be cool, so to speak!
Hoping someone can help as I have a long, long weekend of driving!