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This used to happen to police Omegas very often. As per @TRA 's suggestion but try it on a quiet straight road. Reverse to as high a speed as you are comfortable and brake lightly for as long as possible then brake hard at the very end. If you've been driving with a stone in for a while it might take a few goes to clear it. I don't know what calipers you have but 30 mins jacking it up and whipping the pads out might actually be quicker in the long run.
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Anyone had a stone caught between brake pad and disc
Not quite, had a stone between the metal shield and disc that took the main dealer to remove. It was the only thing that went wrong with the Suzuki Swift that my daughter uses in 5 years of ownership. This include summers in Provence and winters in the Alps. It was in France at the time and they didn't charge.
Can recommend Swift's.
Anyone had a stone caught between brake pad and disc?
500 miles ago changed the front discs and pads and have been fine, then yesterday driving to Keswick the front brakes started making an unholy noise and braking isn't as good. Inspecting the front left disc there's a deep groove on the otherwise brand new surface. Away with my partner's family so weighing up getting oily and busy with the very limited spanners I have, or taking it to a local garage.