We have them nearly every day now, say they are doing work nearby - then "my father says you will be selling your caravan"..... red flag warning. After about the 3rd one of this kind I thought about time the police knew, especially if my caravan was about to be targeted. Amazed that police came within 10 minutes of the report to the helpline (not 999) , they took details of car registration numbers I had, but some of them parked at the rear of the village hall so were not visible in our road. Said they would visit local encampments but in the meantime told me what precautions I could take - never never open the door, keep it locked, if you can observe them from another window first then do so, have a strong chain fitted on the door, so if you do decide to open you can ask for identification first, put a sticker in the window "No cold selling etc." cost me 99p on Ebay with free P&P !!, secure caravan obviously (already done), 2 policemen were charming, concerned for my safety and urged me not to be taken in by these people. We are very rural so seem to be prey to these people as a soft touch.