Betterfromabove.
It is perfectly legal to land with 30 minutes fuel remaining. Again, you may not like it, but EU OPS allows it. You can't plan for it, but you can do it.
In the LHR scenario, the operator would have to allow for a missed approach, vectors/routing and subsequent approach before getting down to 30 minutes remaining.
Taking the argument on, you could refuse "planned fuel" for the two runway CAVOK airfield with no diversion. Ops then offer Northolt as a diversion airfield for LHR (A319/BAe146 or similar?). The diversion fuel for the other runway at LHR would probably be about the same. Which would you be most comfortable with?