No, you're not likely to face any police action at all.

You must inform your insurance company promptly, however.

Someone drove into my stationary car - I was in a queue and they wefre coming in the opposite direction. As it was bodywork damage only the police just made sure details were exchanged. If there in an injury or someone fails to stop they then become interested.

Without a diagram I cannot work out how their driver's front corner hit your drivers door/ The nearest I have seen was when someone straightlined a mini- roundabout, i.e. too fast for the conditions.

I guess you wern't drinking, under the influence of drugs, not speeding, all your lights work OK, the tyres are legal, the car is taxed (MOT'd if appropriate) & insured for you to drive, and you have a valid driving licence for the class of vehicle in question ... and didn't drive off without stopping to exchange details ... so sounds like you won't be fined, be awarded points or any other nasty, just make sure your insurance company is aware and be prepared for a reduced no claims discount next renewal (assuming the other party makes a claim that is regarded as your fault) and possibly to fund your insurance excess.

I would argue that the other driver hit you and failed to look where they were driving, irrespective of which lane you were using they should have checked to see where you were and made sure they didn't drive into your car. Perhaps you'll get a 50/50 split claim, then if you don't make an insurance claim you might even protect your no claims discount.

Someone has just driven into my drivers door causing damage to their drivers side front corner. It's a roundabout I'm not used to and the signs said middle lane for straight on. ....

I'm trying to picture this and can't, unless you were entering the roundabout and they were already on it and approaching at 90degrees. The wording suggests contributory fault - damage to the front of a car is almost always that driver's fault unless you suddenly went into their lane across lane markings (and then I would expect their damage to be front passenger side)

Anyway, roundabout bumps are two-a-penny, and great business for insurance companies who will argue it out at huge expense to the premium payers. Then each of you will be obliged to have the repairs done at maximum cost because 'it's an insurance job' - that's if they don't try to write off the car ... 'cos the repair will cost more than it's worth...' You will also both probably get a call from a heavily accented shyster insisting you must have sustained a severe whiplash injury .....kerching! Heigh ho.