Sorry to go on about this, but one question: in the UK are speed camera penalty notices issued by and administered by the Police or by a government department or an organisation which the government has contracted to administer the fines? A quick Google seems to show a government department.

If it isn't the Police who issue and/or administer the fines, you would need to write your letter to the government department or other organisation and ask them to investigate the issue. If that's the case, the Police would have filed it under "F" for "future reference" (maybe) or more likely "forget about it". :-D

The approximate dates of receiving the letters and also the visit from the bailiff are all in this thread. Also it would help to mention how long you have lived at your current address before stating that the person named on the notices has not lived there in that time. If I am writing an official letter, after stating my issues, I always write a short paragraph at the end with a request for the action I would like them to take, e.g. cease and desist sending the notices to your address, and also you could suggest that they investigate the circumstances surrounding the use of this person's name at your address to see if anyone has used your address for dishonest or illegal reasons.

You probably won't ever find out the complete true story but you should be able to get them to cease and desist sending the notices to your address.

They may ask you to send a certified copy of your identification documents. It might be helpful to phone their contact centre to find out if there is anything they require to speed up the processing of your letter.

Good luck!