Wrong Fuel in a Volvo v70

This evening i had a mission to get to Ealing to do a Fuel Drain on a Volvo v70 that had put 30 litres of unleaded petrol into a diesel engine.The customer had run the battery down so i had to plug the battery charger on just to get the Wrong Fuel out of the second tank over into the first tank then i was able to drain the Wrong Fuel out and get the Volvo going,it took about 45 minutes and the customer was so happy he gave me a very nice bottle of wine.