Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
BRG Metallic. 62000 miles with immaculate paintwork and history from new. Recent new full stainless exhaust system. Detailed under bonnet. Maintained regardless of cost. Private plate [valued at £1500]