Dott

The Dott e-bike and e-scooter sharing service lets you pick up one of its two-wheels in your vicinity and go. They aren't available around all of London and you have to leave them in designated areas, but finding them is made easier as you can tap a button in the app to ring their bell. They also offer the option of pausing your hire for up to 60 minutes, so you can leave your bike to run some errands and know it'll still be waiting for you when you're done. Dott two-wheels can also be booked via the Free Now app.