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Firefighters were called to a blaze at petrol garage on the A2 on Tuesday.
Crews from Thames-side were called to the Esso garage at Cobham on the London-bound carriageway at 12.30pm after reports of a tractor and its trailer well alight.
Around 120 litres of diesel is also beleived to have spilled onto the forecourt.
Crews put a stop to the incident 40 minutes later.