Mailboxes in Wimbledon and Merton. At Access Self Storage in Wimbledon we provide a full mailboxes service for local small businesses and start-ups needing the credibility of a business address. Our mailboxes and post-receiving service provides an easy solution. With round the clock access to your mailbox, combined with our many other businesses support services, business owners throughout Wimbledon, Merton and South West London can maximise their working day.