Hi there try www.honestjohn.co.uk

Main problems are rust under the wing mirrors, rust on the door sills when you open the doors, speedo's that drop to zero when you are on the move which is the VSS sensor going with wear and tear.

Thats the problems I have had on mine apart from the rust in the sills, take it for a test drive and just listen for anything weird when you are driving.

I've only had my focus for about a month and a half and it is 5 years old but it's great.

Good Luck

Davy