The police can and do go out on the street but you are unlikely to see them patrolling on foot. That is done by PCSOs, which is why you see them. And they see more than can be seen from a patrol car. PCSOs have little paperwork to do, which is by design, allowing them to stay on patrol. They call the police if anything serious needs attention. Also by design. Which doesn't mean they wouldn't welcome more powers.
IMO police could retire later, using their skills during their, say, last 5 years, doing some current civilian posts.