There are different types of gin. What are they about?
London Dry gin doesn't necessarily come from London. Most of London Dry's actually don't. It just describes a production style: first a base alcohol is distilled; which is then re-distilled adding juniper berries and botanicals. Only natural flavourings are permitted. After this, only water can be added, to dilute the gin to a certain alc.vol. percentage.
Distilled gin is different: as for the London Dry a base alcohol is distilled, then it's re-distilled with juniper and botanicals and after this process water and flavours can be added. Quality distilled gins will only use natural flavourings (so no artificial shizzle, like in the London gin). These flavourings can either be distilled themselves or not.
OK, so it's somewhat complicated. As for VOLUME 7 GIN: it is a top notch distilled gin. So first the 100% barley grain base alcohol is distilled and then re-distilled with juniper berries and botanicals. Afterwards only water and natural, distilled flavourings are added. It's the real deal and good old craftsmanship.
And then there's compound gin. This means that after the first distillation of the base alcohol, there is no second distillation. Only flavorings (natural or artificial ones) are added. Hmm, yeah, well... you might consider them a bit fake.