Sounds like the tappets, Pretty normal to be honest my ST is a 08 with 5k on and the tappets are quite loud.
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2008 Performance Blue Fiesta ST,Full Leather,Heated Seats,Interior Styling Pack,Bluetooth,ESP,Sony Headunit,Auto Headlamps,Auto wipers,Parking Sensors,
Modifications
K&N 57i
Colour Coded Bootlock
Smooth Rear Wiper
ClimAir Wind Deflectors