My sister in law who is 75 and a reasonable driver is very upset to receive a letter from the DVLA saying that a "third party"has contacted them questioning her driving abilities!They are saying they will revoke her licence unless she gets the enclosed forms completed by her Doctor.She has to arrange a medical and I presume pay for it.She has contacted the Licence office who refuse to divulge who has contacted them.The whole family and her friends are all under suspssicion! Her licence is not up for renewal for 11 months and I find it incredible that the .D.V.L.A appear to be acting on some type of tittle tattle!!Her Doctor says it's not them!As do everyone else she has asked.She is not bothered about having a medical but is upset and annoyed about it.Anyone else had a similer letter??