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if its locked in one position (won't move when when trying to adjust) it will be the little metal clip in the runner snapping. Its a common problem and easy to fix with a second hand runner set for roughly 20 quid.
There's also a common issue of the seat won't slide when using the handle to let passengers into the rear, it'll allow the back of the seat forward but won't slide towards the dash. There's a small round pin that's fallen out and is probably loose under the chair, just needs popping back in.