Benylin?

[MeezerMeezerLemonSqueezer]

Can you still buy the original cough mixture? I have seen 'non-drowsy' which I don't want, because not only does it not have anything in that makes you drowsy, I think it contains something to keep you awake and I can't sleep when I take it. But that's all I can find now.

Yes you can still buy it. You need to look for Chesty Coughs Original rather than Chesty Coughs Non-Drowsy. This is it:

https://www.superdrug.com/health/cough-cold-flu/cough-medicine/benylin-chesty-coughs-original-cough-syrup-150ml/p/457191

There's a Benylin Night formulation, you can it for chesty or dry coughs. I've been using it, and it's pretty good.