Young’s APA kit - coming out flat

[Hazelwood Brewery]

Of course you could consider Cornies

 

[GhostDoggyWoofWoof]

If you don't have fridge big enough for a cornie then you could get 2 PET Cornies. And rotate into frdge as required.

 

[Davegase]

So now I’ve put it back in the fridge and enjoy once cold - or is that going to make it flat again?

It won't make it go flat but the pressure will reduce as the CO2 in the headspace will start to become dissolved in the beer at lower temperatures.