Sliiiight thread drift, but...
If you have a (UK) level 2 variation to get home from Egypt and slide right up to the end of a 2 hour discretionary extention such that you will land at 1hr 59m into discretion, will you be illegal as you hit the TOGA switches?
If I elect to return home when knowingly going into duff weather and then something nasty happens such as a landing accident at my diversion then it could be argued that I knowingly passed the extension limit. Do you see where I am going with this?
The practical answer is straightforward but the legal aspect is not so clear.