In Highway code it is defined as Coasting where running a vehicle in neutral or disengaged gear reduce driving control, hence drivers are advised against it.
Coasting reduces engine braking, which can boost downhill speed. The footbrake may lose effectiveness as a result of excessive use.
Unfortunately, a Neighbour parked in the spot they'd reserved.
Improper vehicle handling is penalized by a £1,000 fine or ban. The fine will be more for a bus, coach, or HGV which is £2,500.
Drivers are cautioned to avoid automobile damage. Persistent coasting wears down the brakes.