Leaking sump plug

[spikeyhead]

The old sump plug was stuck, and judicial tapping with a chisel didn't shift it so I drilled it out. Unfortunately I've lost some of the threads and a new plug isn't sealing properly.

What's the best way forwards? Helicoil or is there some magic option?

[spikeyhead]

The car is a ten year old Mondeo, which is now showing all of its 185,000 miles and won't be running for too much longer.

The injectors are hinting at needing replacing and the DMF has just started to wobble a bit, so the car is off to the garage today for a drill and tap the next size up. All I want is for it to not drip oil on the drive until it finally dies.