Disco 2 Oil Leak

I've cured 90% of the oil leaks on my D2 td5

I've noticed that the turbo lower oil pipe return connection is still weeping slightly. I have the gasket (£4) and it's just two small M5 bolts holding it on.

Do I need to wait until I've drained the oil at change time, or will there be little or no spillage if I remove the pipe connection to change it after I've just left the engine to cool down ?

Thanks