ford mondeo tdci mk 4 - Attempted theft of fuel - christallant

Hi, some git has drilled into the rubber seal under the fuel filler pipe. Does anyone know how much it will cost to put right? If I can still put fuel in until it is sorted? Is it safe to drive? There is no apparent leak other than what I have cleaned from the bodywork after the thieves had finished. I reckon that they only got a few litres judging by how many miles to empty it went down. Cheers.