We don’t particularly have many headline things but our use of Kubernetes on AWS means that we can get far more out of the resources we use in terms of utilisation than many other banks who may run one thing per system.
In terms of the office, we have pretty great recycling here in the London office, I forget the exact numbers unfortunately. We tend to like to pick suppliers for things such as food who don’t give us excessive single use plastic. The majority of our lighting automatically turn to motion sensors in the evenings so lights are not left on overnight.
For transport, we’re encouraged to cycle and take public transport wherever possible. It’s less of a policy and more of a norm.
On the product, we don’t normally send you letters and our card carrying envelopes don’t have plastic windows so it’s easy to recycle everything once you receive your card.
On the card itself, it’s possible to recycle a cut up card in some places but we’re always looking at new, more recyclable materials. In addition, one of our card suppliers I recently visited has a zero-landfill policy in their personalisation building.
Our laptops get sold, reused, donated, or recycled at the end of their lives depending on condition. We’re almost entirely a MacBook company so this is highly recyclable aluminium and glass.
We generally print little to nothing so there’s no excessive use of paper (both an environmental and security gain!). We also do a fair amount of remote working and lots of remote meetings so that nobody has to excessively travel for a single thing.
These are just a few things off the top of my head from working here over the last few years, they may not seem dramatic but a lot of small company culture things add up. 
