i got mine for £6000 2 years ago and it had 41k on it, it now has 70k and is worth about 3500-4000 but the ST prices have crashed recently so your buying at the right time!
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Red Escort 1.6LX
Then - Red Escort 1.4
Then - Silver Fiesta ST 170BHP
Then - White Fiesta ST MR200+
Now - Mitsubishi Evo IV Forged 2.3 500BHP
and Mondeo Mk3 2.0TDCI