subframe fixes

[DuncanR]

Discovered this crack last week, is this in the right area to be classified as the usual type of cracking. Bear in mind that my car is caged albeit the cage does NOT pick up onto the turrets, which is a shame.
The bottom pictures is taken from the Offside of a UK car, looking out and up towards the wheel , its on a seam, under normal circumatnces I would drill the end myself now to stop it going further, which it may have done after this week-end ! But as its under warranty still Im loathe to do so. Thoughts oh wise expereinced crack heads