Off-site airport parking is safe when the operator holds Park Mark accreditation, the site is fenced, lit and CCTV-monitored, and the product is keys-retained. The risk sits almost entirely with unaccredited valet operators, not with park and ride.
Park Mark is the Police-backed UK standard for car parks, assessed against criteria covering perimeter security, surveillance, lighting, cleanliness and management. It is not a guarantee against theft, and no accreditation is. What it certifies is that the site has been inspected against a published standard and continues to be reassessed.
For an off-site airport car park it is the single most useful signal available, because the alternative — judging a field near an airport from a website photograph — is no signal at all. Every operator listed on this site holds Park Mark at its main sites, and where an operator's accreditation is partial we say so on its page.
Your car is covered by your own motor insurance while it is parked, not by the car park's. This surprises people and it is true at every car park in the country, airport or otherwise. The operator carries public liability cover for its own operations — for damage caused by its staff or equipment — which is a different thing.
Where this genuinely matters is valet parking. When someone else drives your car, that driver must hold motor trade insurance covering the vehicle in their custody. Reputable meet and greet operators carry it as a matter of course; the operators that make the news are usually the ones that did not. Asking about it before booking is entirely reasonable.
With park and ride you park the car yourself and keep the keys. The car does not move until you move it. The risk is confined to the security of the site itself, which Park Mark addresses directly.
With meet and greet the car is driven twice by someone else and stored somewhere you have not inspected. The overwhelming majority of these bookings pass without incident, but the risk category is different and the mitigation is different: photograph the car at handover, record the mileage, and do the same on return. Reputable operators do this themselves and give you a copy.
The stories that circulate about airport parking — cars used, mileage added, vehicles found in fields — come almost exclusively from the unaccredited end of the valet market, typically booked through a price-comparison listing with no operator name attached. Booking a named operator with a checkable accreditation removes most of that exposure.
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