Dashcams have gone from novelty to normal: pull up at any set of lights and half the cars in front have one stuck to the windscreen. The pitch is simple: if someone drives into you and then lies about it, you've got the truth on video. Most of the time that works. But a dashcam only helps if it's set up properly, if the clip you need is still there when you go looking, and if the footage actually shows the moment that matters. Get any of those wrong and the camera is just an expensive dashboard ornament.

What insurers actually do with footage

When a claim comes down to one driver's word against another's, an insurer has to decide who to believe, and that decision costs them money either way. Clear video takes the guesswork out of it. If your footage plainly shows the other car pulling out of a side road into your path, the argument is usually over before it starts: liability gets settled quickly, your no-claims bonus is protected, and you're not left carrying half the blame on a "knock for knock" split just because nobody could prove anything.

That last point is the one people underrate. Without evidence, disputed accidents often get settled 50/50, not because anyone thinks both drivers were equally at fault, but because it's cheaper for the insurers than fighting it. A 50/50 outcome still counts against your record and can push your premium up at renewal. Footage that pins the blame where it belongs is worth far more than the small discount a few insurers give you for having the camera fitted.

The footage has to actually be usable

This is where dashcams quietly let people down. A camera that's been recording for two years without anyone checking it can throw up nasty surprises at the worst moment:

  • The clip's already been overwritten. Dashcams loop: when the card fills up, the oldest footage is deleted to make room. If you don't save the file soon after an incident, it can be gone within a day or two of normal driving. The moment anything happens, stop and lock or copy that clip.
  • The number plate isn't readable. A cheap camera in poor light, or one pointed slightly too high, records the shape of a car but not the plate you need to identify it. Test yours in the dark and in the rain, not just on a bright afternoon.
  • The time and date are wrong. Footage with a clearly wrong timestamp is easy for the other side to pick holes in. Set the clock, and reset it after the clocks change.
  • The card's corrupted. Memory cards wear out with constant rewriting. A card that's been in the camera for years may have quietly stopped saving anything. Reformat it every few months and replace it when it's old.

None of this is difficult, but almost nobody does it until they've been caught out once. Treat the dashcam like a smoke alarm: it's only doing its job if you check it occasionally.

Front, rear, or both?

A front-only camera covers the most common shunts, but a huge share of disputed claims are rear-end knocks: someone going into the back of you at a junction, then claiming you reversed into them. A rear camera, or a two-channel system that records both ways, closes that gap. Parking incidents are another one: a camera with a parking mode that wakes on impact can catch the car-park scrape whose owner drove off, though it'll drain your battery if you leave the car standing for weeks.

When footage works against you

A dashcam is an honest witness, and honesty cuts both ways. The same clip that proves the other driver jumped a light will also show if you were doing 45 in a 30 on approach, glued to your phone, or drifting across a lane. You're under no obligation to submit footage that damages your own case, but you can't doctor it either, and if the other side knows you had a camera running they may well ask for it. If your everyday driving wouldn't embarrass you on video, this is a non-issue. It's only worth a thought if you'd rather the camera hadn't seen what you were doing.

Where a history check fits in

A dashcam protects you from what happens after you own the car. Checking the car's history protects you from what happened before. The two aren't related jobs, but buyers who care about one usually care about the other. And if you're buying a used car that's already got a camera fitted, the footage on its card can occasionally tell you something about how the previous owner drove it. More reliably, a full history report shows you the MOT record, the mileage trail and the tax position before you hand over money, and a quick free MOT check is a sensible first look at any car you're considering. A dashcam and a clean history are the two ends of driving a car you can trust: one for the road ahead, one for the road behind.

The short version

A dashcam is one of the cheapest bits of protection you can add to a car, and on a disputed claim it can be the difference between keeping your no-claims bonus and losing it. But it only works if the footage is clear, the plate is readable, the clock is right and you save the clip before the loop erases it. Buy a decent one, point it properly, check it now and then, and hope you never need what it records.