As far as the press release goes, it says:
This usually means that employees will raise money and Britvic will undertake matched giving (and everyone does well out of it). Half a million over three years is not a large contribution for a corporate sponsorship deal, so it seems that this is more likely what it going on. It doesn't usually mean "Britvic will stump up a ton of cash to have DUK promote their drinks".
And secondly:
I don't know if anyone else has a "Charities of the year" programme at their place of employment, but this feels a lot more like that type of enterprise than what it is being portrayed to be by the anger in this thread.
And has anyone considered that by being involved with Britvic, it might give DUK the opportunity to influence branding, sugar content and other factors that affect the product they produce, both directly and indirectly through employee engagement?
Before we jump up and down and stamp our feet, perhaps we should take a minute to understand what this "agreement" really is? Just a thought.