Those things are what "extra " fuel is for.
- to correct you, HS, that is what trip fuel is for. The CAA made that quite clear in their 'special' review of Airline Ops. Reference provided if required. So, for LHR, you SHOULD increase TRIP fuel
ON YOUR PLOG by at least 20 mins holding fuel. If your airline whinges at you, quote the CAA paper and ask for an 'official' response
