Improve User Interface for selection of multiple Extras

The facility to add more than one Extra to a booking works, but it isn’t the easiest to use when booking via mobile as is requires tapping into the number and adjusting the amount using the keyboard.

We will add clear + and - icons to either side of the amount for the Extras to make it easy to increase and decrease the number in their basket.

We will also limit the max number for Attendee Extras, so customers don’t need to wait until they click ‘submit’ to see if there is space available for the number they have added.