Gaymers make, err, what exactly?

Here's some recent outdoor advertising from Gaymer's. That lovely ice cold drink. Young, attractive ladies drinking it in a trendy bar. Just the sort of thing you may like to associate with in these 'hot' summer months. But what is it? The bottle looks like a beer bottle. Fortunately, from having grown up in the South-West of England, I know it's a cider. Cider has had a bit of a rennaissance recently with Magner's, but they are hugely proud to announce what they make. Gaymer's seem to have forgotten.